Patio Clean XTREME Powerful Concentrated Cleaner for Black Spot, Algae & Lichen

Was completely blown away by the transformation when we used your patio cleaner, wasn't the cheapest but worth it for the results. Now we just need to get the sealer.

This patio cleaner was excellent and really did clean some very black spotted paving. Beware of your clothes though, I was a bit careless and got some on my trousers and it stripped the dye out of them too!

I applied the product to part of my patio according to the leaflet. Only did a small area as the smell of chlorine was unexpected. The following morning the treated area was 70-80% cleaned but several of my slabs were still quite black. Used my pressure washer on the area and the cleaned area improved to about 90%. Continued to treat remainder of patio, including the 10% remaining from day 1, this time I used a slightly stronger concentration of product. Repeated the pressure washing next day and concluded the patio was 95% cleaned which I decided was acceptable.

Moss removed but not all black spot lichen. Easy to apply good coverage

We have a small patio (20 sq m) which was in a bit of a sorry state with lots of black discolouration and many large black spots. Looked at various options for cleaning and there are many cheaper options available but settled on this one as the best bet. Very impressed with the ease of use and quality of the final appearance. I would say a good 90% of the slabs are as good as when they were new and the remainder have just a few of the more severe discolouration still visible. I am confident a second application on these few slabs will result in total obliteration. Would recommend this product to anyone.

My block paved patio was in a terrible state with black spot and lichens. I applied patio extreme cleaner and the patio has been transformed. An excellent product that does what it says on the package. Id recommend this product to anyone.

Grateful customer I was very impressed with your patio cleaner. My neighbour recommended it, and I was delighted to be able to order it directly from you. Even in the current circumstances it arrived promptly. I try very hard not to use Amazon for anything. I will definitely use you again. I used Patio Xtreme as per instructions with a stiff yard brush. My patio is irregular concrete slabs, I havent cleaned it since it was laid in 2005. I am amazed how easy (age 60) it was to do and will definitely do it again next year. I had put it off for so long because of the mess it makes with a pressure washer. There are some very small areas that I missed slightly (irregular surface)with the brush which will come off next year. It has come back to the original state in 95% of the area. Sorry I havent any before and after photos, but difference is striking. Thanks again, I have already recommended it to several other people. Best wishes Hilary

Cleaner works extremely well. Totally recommended.

Great product has turned my old patio into new it has removed all the black spots

Excellent product. Completely cleared the black spot from my sandstone slabs.

I had lots of black spot on my driveway, I considered a few products to clean this as pressure washing alone wouldn't remove it. I scrubbed in the xtreme clean covered with polythene to keep it from drying. I left for 3 hours and then pressure washed again and the whole drive was so much cleaner, great product.

Our sandstone patio which originally looked beautiful with a variety of colours ranging from cream to pink to terracotta had, over 10years become a dull flat grey. It had also acquired a lot of dark black areas which could not be scrubbed nor cleaned with household bleach. I wasn't too hopeful that the Xtreme clean would make a huge difference but I went with the other reviews about the blackspot and the results have been fantastic. I am not one to write reviews but I would like to give credit where it is due as I am really enjoying our patio again. IT looks beautiful!

Brilliant will definitely use again

Tried it on my porcelain patio tiles to remove dirt on surface. Recommended by company after contacting them and sending photos. Used as described, but didnt work for me.

Purchased the product to remove many... black marks on our patio stones. I first cleaned all the patio with a Karcher Jet Wash with the appropriate Karches 'patio cleaning' brush tool. This did clean the patio BUT the black 'mold' marks remained. I was advised to try this patio cleaner. I purchased the 5 litre size, read the instructions and followed them twice. Once add a dilution of 1:1, completed the wash cycle and then at 'neat' clean. Used a brush, rubbed in on wettened patio, left for the required time and then jetted off. The Black markets remain. All in all 1/2 day wasted, 31.95 also plus shipping.

Brilliant product, cleaned old patio of 20 plus years with just one treatment

Our limestone paving was only a year old but I was already fed up with cleaning the green algae off it. Ordered this product along with the sealer. Slabs came up nice and clean if a little lighter than before. Good product would recommend. One word of warning. Clean out your sprayer straight away. I left some product in it overnight as I was going to use it on some old slabs in the scruffy area of my garden. When I went to use the sprayer the next day the metal arm on the sprayer nozzle was full of holes. This is a corrosive produce. Use with care. Now I need a new sprayer lol.

The patio cleaner does exactly what it says and was delivered extremely promptly.

It certainly gets rid of stains and marks, although some stubborn algae may need to have a treatment of the product neat.

This is the 2nd time I have used Xtreme clean and the results are great. Great at cleaning the patio but needs to be used with a sealer or colour enhancer to ensure that it stays clean.

I used this patio cleaner on 'fossil' stone paving with excellent results. Most black spot disappeared on first application but stubborn spots went on second. I would recommend this product and will use it again. AS

used to clean black spot of natural stone works well

Removed the black spot from our natural stone patio and now looks like new. So impressed I have ordered a further supply to do the rear patio and paths.

I've now used this paving cleaner twice in recent weeks. Firstly on my patio slabs which I had previously jet washed. The results were excellent. The second occasion I used on my block paving, (which I hadn't jet washed). There was some improvement but not as good as I had hoped. This may have been down to not firstly jet washing. So probably a realistic rating would be 4.5 stars. Would use again.

I agree that this patio cleaner is a much more effective product than most on the market. It's more expensive but worth the extra to get the results that many products promise but do not deliver.

The Extreme patio cleaner was excellent not only clearing the black spots & greying on the Sandstone but bought back the original beautiful colour, great product & service.

Excellent product. Would recommend and will definitely purchase in future years. The patio cleaner does exactly what it claimed and delivery was really quick under circumstances. Thank you

To be fair to this product I had power washed the patio in advance and was therefore not in a best position to judge its full effect.

I have tried a few products but Xtreme Clean is by far the best. After 10 years of neglect it has done a good job. Most of the black lichen has gone. I should have ordered two 5litre packs. We already need sunglasses to go to the patio.

Did a pretty good job on our 10 year old Indian sandstone inundated with black lichen spots. Not perfect but very happy with the result.

Brought our 6 year old Indian sandstone patio back to an almost new condition. Have used several other cleaners over the years, but this product out performs them by far. Great for black spot and green algae removal.

Excellent cleaning product. Patio and wall looks brand new.

Absolutely fantastic. Recommended by a friend who was raving about this patio cleaner so we bought some and when applied, which was so easy, the results were impressive. Will certainly buy again and recommend to our friends.

A great product. Our patio was transformed even after jet washing it first. Easy to use. We brushed on with a broom to avoid surrounding area. Black spots all gone ! We also used the colour enhancer sealer , which finished the job, brought the contours of the sandstone back to life and got rid of the dusty/dry look. Would definitely recommend this product.

Brilliant

Prompt delivery well within timescales provided. Easy to use . Overall worked well although didn't remove all Blackspots despite a few applications but patio looks so much better and still have some left to try on front block paving. Would certainly use again

Having done some research online to compare products I went with Smartseal's patio cleaner in the end. Prompt delivery and it does exactly what it says on the tin. Spraying in on a 1:1 solution and scrubbing patio stones with a stiff bristled brush led to visible results almost straightaway with the blackspot and other markings fading very quickly. I used it neat on some stubborn areas and they came up well too. The patio now looks as if it were newly laid. All-in-all, a very good product at a competitive price (compared to others on the market) and one I'd be happy to recommend. We're very happy with the results achieved using it.

The patio cleaner left a good prept surface to apply the Enhancer onto

Disappointing. Not as effective as products I have used in previous years. Results are patchy and the underlying colours are not at all obvious. I did watch the YouTube video so am fairly confident I applied it as required.

Brick paving comes up nice and clean, sometimes needs another application of the cleaner.

I used had this product previously as we had black spot on our drive. One application successfully got rid of it and the drive looked like new. That was in 2017 and only now in March 2020 did it look like it needed a clean. Didn’t hesitate to place another order and again very happy with the results. Easy to apply and fantastic results. Highly recommend.

Great product and very easy to use. The cleaner removed all the nasty black lichen marks from on our limestone patio and returned its original colour that had been lost over a number of years.

Did what it was supposed to do. Needed two applications but worked on a very grimy sandstone paved area. Still some black spot marks but a massive improvement.

Excellent results using the product as as advised would recommend, even paying more than other products.

Excellent

Extreme patio cleaner is a godsend. Years of trying to clean Indian sandstone patio over the years was horrendous. This product is so easy to use, and cleans it.....I know....so easy. Putting another in.

Easy instructions to follow. Patio cleaner very easy to apply and gave a fantastic result.

Pretty good at removing greying background blackspot and restoring colour. Does leave something of a bleached look that picks up when wet from rain. Gets rid of most of the lichen, but some stubborn bits remain after jetwash and 2 coatings of 1:1 dilution. I've used another treatment in the past that had better results but this product is 1/6 the price and 90% as good

I’ve used this product to clean our natural stone patio. The result is magnificent, all the black spot has disappeared. Easy to apply and very quick result. I will be using this cleaner for years to come!

The patio cleaner did a great job at listing the dirt and stains. looks great after using the ultimate colour enhanced sealer. the team were great at sorting out my order.

Restored 9 year old Indian sandstone patio to look like new - particularly good at removing black lichen

This stuff is amazing! Brought our Indian sandstone patio up like new. Even got rid of the deep black spot. Thanks

Unbelievable product! Totally transformed my block paved driveway in minutes! 5* �👌

Have a large area of concrete which gets green mould fantastic product would highly recommend it thankyou smartseal

Always happy with products I order from smart seal.

Absolutely brilliant product! We were seriously expecting we would have to spend thousands on replacing our patios. Didn't have high expectations but product arrived quickly, was easy to apply and the YouTube videos very helpful. Within half an hour there was a real difference and within a couple of hours the stones looked great again. Can't thank you enough. Will be buying the sealer soon as well.

Very good easy to use does exactly as it says , have ordered for two friends. Can highly recommend.

Fantastic product, does a great job, would advise anyone to use it as it requires very little effort to get a fabulous result.

I was really impressed by the speed with which this order was fulfilled. The product is amazing; the path and patio were in a bad way and it was hard to tell that the slabs weren't all the same colour. This was easy to apply; I gave it a quick scrub over with a stiff broom and then left it to work its miracles. It was great to see the spots disappear as I pressure-washed the solution off. The difference was absolutely amazing; not all the black spots came off but they were really bad so I will give some slabs another go. I used more than I had anticipated so ordered more and with the 3-for-2 offer I now have enough for next year as well. Excellent product.

had forgotten the true colour of our patio and the slabs on our paths they all look fantastic. Just got to treat them with the sealer which I know works extremely well from using same on my drive.

My patio was heavily discoloured with black spots and weather stains. I am amazed at the result one application of this cleaner has had. The patio looks as new as the day I completed it four years ago. I would strongly recommend it.

Excellent product water now just repels and does not absorb into the concrete and has brightened the patio would use again

What I like about this product is that it spreads easily (like water, not sticky or tacky) and removed dirt, debris and stains on my sandstone slabs. Time will tell but so far I’m pleased with the results.

Just a quick note to say what fantastic products you have !!!!!! I was AMAZED how the cleaner worked so well please see the before and after pics attached. The end result with the cleaner and the ultimate enhancer on the Travertine is simply stunning !! Cheers . John Whitby.

Fabulous stuff! I have tried so many products to get rid of the black spots/Lichen on my patio. This has done the trick.

Did a good job on relatively clean patio. Needed second neat application,but still some black spots Overall quite pleased compared to other products tried.

Not fantastic. I had done a deep jeteash before using this and had to do a double jet wash to get the marks off and still there were more left even after using it neat.

Fantastic. I used this neat as the black spots were very bad. Works almost instantly. Could see the black spots disappearing before my eyes. Patio looks like new. Well worth the expense. Also very fast delivery service.

Great product. Excellent results on our sandstone.

Excellent product! Easy to use and brought my block paving drive up like new. I have ordered more for my patio

Does what it says

Very good product and quick deljvery

Great product .The results were hard to believe. best patio cleaner I have ever used

Excellent brought my sandstone up like new

Excellent, does all it says on the tin.

It did exactly as it said very pleased with the results

Fantastic product well done guys all around great company

Excellent product! We were thinking of having the drive renewed but decided to try this product. We had a considerable amount of black marks on it which almost seem to dissolve away, a bit of effort with a brush is also needed, as you would expect. Result was great and saved us a fair amount of cash.

Great product; brought the patio back like new and removed all the black spotting.

Used it on my sandstone today. Black spots have gone. Paving looks like it was when it was first layed. Great product. Will buy again.

Excellent results. This removed about 95% of the black spots. We're very impressed with this product. Easy to use and it did what it said on the tin.

Brilliant product. made an amazing difference to the patio. Thank you.

I agree with Keith from Manchester. Very soiled paving slabs washed with pressure washer not good so ordered Smartseal and it’s almost like new. Wished I had ordered more but 5 litres to 25litres was too big a price jump for me. Would definitely recommend and use again. Need new jeans as bleach stained!

Arrived quickly and was well packaged. Greatly improved after just first application but will need to give both patios a second treatment as never been cleaned in 10 years. Impressive start.

Absolutely brilliant. I could not remove the dirt and stains from my patio with a power washer but this stuff has bought them up like new. Applied it with a sprayer and left for one hour and Bingo, slabs look like new.

Took off black spots, algae and stains off ten year old Indian sandstone that had never been sealed after 2 applications. Absolutely fantastic product! Yes it’s quite expensive but it’s well worth it. Bought a couple of sealer samples (wet look and ultimate enhancer to try but waiting for the weather to clear up. Thanks Smartseal!

Excellent product, gives a nicer finish than jetwashing.

Great product, previously cleaned with my power washer and their stone cleaning product, not a great result so I thought I'd try 5 litres, pleased with the results, probably should have bought more so I could have given it a second go. Warning to wear old clothes, left a few bleach mark spots on my shorts. Delivery was very good.

Best patio cleaner I have used to date. Used on sandstone flags. Which year on year have gradually had more black spots. Never have looked as good. Followed the directions mixed 1:1 and left for 2 Hours. Could see the results starting to appear and then gently jet washed off. warning the product will take colour out of anything else it comes into contact with so make sure you only have contact with the areas you want to clean. Well worth the money.

Amazing results on very stained and spotted paving. Simple to use and very quick. Delivered in no time! Will buy again.

Sadly, this hasn't been the miracle product for me that it has been for the other customers. It HAS made an improvement, to the appearance of the slabs, but not as much as I had hoped - perhaps 40-50% of the algae and lichen has been removed , when used exactly as per the instructions and at a 1-1 dilution. Rather disappointing.

Easy to use and great results Paving looks like new

Fantastic product ! Used on Indian Sandstone that had turned green and was covered in "Black Spot", used as prescribed and agitated with a stiff broom, after 2 applications the Sandstone returned to as new, highly recommend this product.

Astonishing results with this product and only the most stubborn spots on sandstone require a second application coupled with a bit of elbow grease. Applied the sealer five years ago and an equally good product which until now has prevented any staining.

Had not cleaned patio for at least two years and covered in black spot i have two treatments and it worked brilliantly good as new really recommend this product will buy more to help keep patio clean.Thanks for good �� product

Amazing transformation to my 15yr. old Indian sandstone patio. Used 1:1 . mix as advised and left for dead on 2 hours before washing off. Most of the slabs are back to looking like new although some of the white spots will need a second treatment. So easy to use and will now be using this every year. Brilliant product.

Used as per instructions prior to sealing my Indian sandstone patio. Worked a treat and happy with end result.

I used this product on my Indian sandstone patio and had excellent results.When cleaning a patio we have two problems first dirt then black spot. I first washed the patio with warm water and a small amount of washing up liquid using a broom,then rinsed with a hosepipe, I then applied the product diluted as recommended. It was too windy to use a spray so I applied by broom and left it for a minutes, then went over the patio again whilst still wet with the broom to work it into the surface. Result super.

The product worked well on 20yr plus slabs with out to much effort.

I must admit I had reservations as to whether this product would remove years of dirt and black marks. I can report that although I have not yet finished cleaning my patio, what I have done has produced excellent results. Would I use this product again, certainly. Would I recommend this product, definitely.

So disappointed in this expensive product. Used on Indian sandstone for algae and black spot. I applied it undiluted to my wettened patio, left it for 3 hours and washed it off with a high power jet washer but it made little difference to the black spot. I reapplied a further undiluted coat in the same way, left it for another 3 hours and again blasted it with the jet washer. Patio still very black. Will give it a further go today, but not very hopeful. RESPONSE FROM SMARTSEAL-The reviews of this product are normally very positive. We have spoken to our customer, we requested pictures and are working with her to hopefully achieve the results she was hoping for.

Incredible - best product i have come across and i have tried loads- will never use anything else again

Fantastic product works brilliantly on concrete that's prone to algae cleans it up a treat would highly recommend this product

Fantastic product works brilliantly on concrete that's prone to algae cleans it up a treat would highly recommend this product

Cleaned the stone but did not remove black spot. SmartSeal helpful in trying to resolve but not the right product for the job.

I used this for the first time and it did get rid of most of the black spots. It will probably need another clean again in the Spring. Overall I was pleased with the result.

Tried literally everything on my Patio, Bleach, Sodium Hypo, Patio Magic, Patio Buster. Nothing removed the black spots. I have scrubbed and pressure washed to no avail. I thought I would try this product. It came this morning diluted 1 to one and applied with a watering can. In 30 mins most spots had gone. A quick brush over with a little more on the tough spots and my patio is now like new!!!! Excellent product, highly recommend this my only regret is I did not use it first being a tight Yorkshire man I tried all the cheaper options first. This really works! James

Excellent product. Bought my 15 year old patio back to virtually new condition after jet washing in vane . I use it all the time now as part of my paving business to restore past projects from years ago with great results everytime.

This is a brilliant product. Removed all the black spot . No amount of pressure washing achieved these results. Easy to use as well . Just wellies and rubber gloves and would have worn goggles if i didnt have glasses. Lot less effort than pressure washing as well. Thoroughly recommend.

Excellent product , very pleased with the result. Only a few stubborn flags needed to be treated with a neat application the majority of flags were okay with the 1:1 application. Definitely recommend this product.

Had the heaviest of Black mold on an aged patio. Tried various other mold cleaners and nothing worked. Before spending a fortune on a new patio gave it one more shot and purchased this. Results are incredible. However for me I did need a wire brush and heavy scrubbing while the product worked. Initial use on a wet patio didn’t penetrate enough. Yet this was age old mold. The entire slabs being black. Can’t wait to use sealant and can pass photos when done. Saved me a fortune. Tip - always use wet and scrub stubborn mold with wire brush to cut open so product can work to root. They sort of pop and release A black soot that later gets eaten by the product. But excellent. Buying 3 more for some brick work and second patio area just to have some spare if I ever need it again. It works.

Wow! Truly amazing results. Cleaned our patio before our very eyes. Black spot and moss just disappeared. Best product I have used for this purpose ever!!

Applied to a limestone patio as prep for sealing. Left a pristine surface. First class product.

Fantastic product does what it says it will do so efficient . fantastic service and delivery spot on thanks guys for making my life simple on my concrete yard

I have a large Indian Sandstone patio that I give an annual jet wash to, but it had never been treated for lichen - over a decade of black spot accumulation! After reading the reviews of PatioClean Xtreme, I decided to give it a go. I firstly jet washed the patio. I then followed the instructions, wetting the patio before applying the diluted product using a spray can. I used a stiff broom to rub the product into the patio tiles, before leaving for a couple of hours prior to a hose wash. I have to say the tiles came up very good, the transformation was amazing. The patio is almost as new, although I was left with some stubborn black spots that had faded but not disappeared. To be expected given the decade of non treatment. These stubborn areas were retreated with the neat solution, and they came up better although still visible. I expect further treatment may completely remove all the black spots, but I may just accept the result as good enough for this year.

I first pressure washed the concrete paviors and whilst wet applied the cleaner and wire brushed until all signs of black spot had gone and then washed the stones with clean water. Pleased with the result. I took great care not to get any of the liquid on to the leaves of any plant nearby.

I had tried everything to get rid of the blackspot on our sandstone patio, came across this site whilst surfing the web. Although I thought expensive I thought I would try it and I'm so glad as it really does work and we can now see the fossils within the stone, some of which we didn't know we're there. You will be very pleased with this i would say 99% for me as a couple of very light marks remain but it looks fantastic

Best product on the market. We have a porous Indian sandstone and over the years we have become very disheartened as it was covered with lichen. No amount of kartchering would remove it. This product is brilliant, some stubborn areas require 2 or 3 application.

Excellent product dose exactly what it proclaims to do. 10 out of 10

An amazing product that has made our Indian sandstone patio look like new. Easy to apply with little scrubbing required. Washes off with water. Doesn’t remove the cement joints like a high pressure hose can.

Have been searching for a product that would do the trick on my 35 year old patio, which was covered in black spot. I have spent hours over the years scrubbing with all sorts of products, to no avail. One treatment with your product has given me back my patio in pristine condition. The slabs look as if they've just been laid .Thank you so much.

Well impressed it done the job . I thought this better work at this price and it did .

Great cleaner, patio perfect.

Pretty good and better than basic patio cleaners. Some spots took multiple of applications and a lot of physical effort to remove. OK for white spot removal as well. There are better cleaners but at significantly more money so this is reasonable value.

Product works well. Prompt delivery. All seems good

It did exactly what it said it would do. Excellent product, handle with care very powerful

This is truly a brilliant powerful and effective patio cleaner. We had given up on getting anything that would remove the black spots on our Patio stones. This product did the trick, our garden looks new now, Highly recommend this product.

Message: Yesterday I cleaned my Indian stone patio with your product Clean Xtreme and am thrilled with the result. I have struggled over the years to get the black spots removed without success but your product is absolutely brillant and does all that it says. I am now going to purchase your patio sealer to finish the job. Amazing, so pleased with the result.

Like a lot of reviews on here if you have an old patio you go through a learning curve as you try to get it properly cleaned up. You start with pressure washing to remove the muck. Next stage algae cleaner to remove that lot and finally you are left with left with quite a few black spots which you then learn are lichen. You try bleach to no avail. Save yourself the learning curve and go straight for this stuff, it removes everything organic on your indian sandstone and leaves it ready for sealing. Excellent product.

A remarkable product which easily and efficiently cleans and restores patio paving.

Excellent brought my patio up like new ,will be buying again

This stuff is unbelievable, could not clean my patio properly with power cleaner, put this stuff on and the patio is like new.

Effective, but on heavy soiling requires more than one application which could make it expensive. In warm weather I found it best to ever with a sheet of polythene to prevent drying too quickly.

Highly recommend this product. We have tried many things to remove the black spots on our garden paving stones. Nothing worked. So delighted with this product it has removed all the ugly black spots and my garden looks like new.

Must require this product before apply the seal as it will deep clean your tiles.

Used the product on Indian sandstone which had gone green with algae and lost its colour. Sprayed it on and then jet washed off after an hour They came up like new with all the individual colours of the stones - look brilliant Was a little concerned as to how it would react with the Easyjoint which was used between the flags, but it didn't seem to affect it in any way apart from cleaning it.

Must require this product before apply the seal as it will deep clean your tiles.

Brilliant product. Does exactly what it says on the container. Patio looks like new!

This pruduct worked, however I got the best results by using it undiluted with water. It removed 97% of the black spots. This product also brought my Indian paving stones back to life they now look the same as when I bought them brand new 6 years ago.

This is an excellent product. Our patio had been neglected for a couple of years and it also has a large tree which overhangs it causing various staining. We used this product to clean it. As the patio was so bad we did use a bit of elbow grease using a hard brush but it was worth it for the end result, I will definitely use it again.

This is an excellent product. I have been through a couple of jet washers and hours of spraying and who knows how much the cost of water I have used over the years. If only I discovered this before! So easy and so effective. A great purchase and my limestone slabs look great on my patio. I had hoped some rust marks might have come off from some metal furniture but I understand as it wasn`t advertised for that.

Excellent product. Brought my 15 year old patio back to looking as new as the day I laid it & with minimum effort. Just sprayed it on & washed it off after 2 hrs & bang!! Spotless!! Best product on the market by far.

Great stuff. Removed the black spot really quickly from my Indian sandstone. It was easy to use and left the stone looking like new.

What can I say that has not already been said. If you have black spot on your patio, buy this. No hassle. Diluted, applied using a watering can and waited. Patio is great, so pleased. This was only for a very small area at the bottom of my garden where we sit, which is shaded by a tree; I would imagine for larger areas it would be expensive, but, it cheaper than new patio and it totally looks like new.

By far the best product for cleaning dirty, grimy patios. They come up like brand-new, great product.

Very good results, better than expected, tip - wear a mask when applying and wear old clothes. Interesting to see how long it takes for the black spot to return? Would definitely recommend product.

Worked very well not cheap but worth it still got some black spot but I will continue to apply until I'm happy. You did need a mask and gloves are a good idea.

Excellent product. After 10 yrs our patio looks amazing! Will be buying it again next year.

Coverage of 5l covers nearer 30m2 2 applications cleared about 80% of the black spot and best if bad areas are pressure washed first to remove the grime. Overall it did a good job on a badly spotted indian sandstone patio

Very happy with the results of the treatment with your product. I used a good pressure washer beforehand to remove most of the staining and was impressed how much more the cleaning improved including most of the removal of Black Spot which has be a continuing problem.

I am generally sceptical about products that claim effortless results. Having tried to blast black spot off my sandstone patio with my Karcher (and failed), I decided to research the internet and give "Smart seal" a go due to such good reviews. Well I wasn't disappointed, just wet the patio, brush it in a bit, and go and enjoy a long cup of tea, or in my case a nice cold beer. I actually left it over night as it was cool and slightly damp. Even before using my karcher to spray it off, it was already considerably cleaner. With the Karcher then everything came off effortlessly. Looks like new, thanks Adrian

Outstanding results, used on sandstone patio - looks just like new. Used neat on badly spotted slabs but 1:1 mixture was fine everywhere else. Important to keep surface damp as directed.

This product is amazing and works far better than I imagined it would. Using a garden pump action sprayer I applied it to the patio, within a couple of minutes it smells like a swimming pool and you can see the product working. After one application and leaving for about an hour I washed down with the pressure washer and the dirt just washed away without too much effort. I will be recommending this and buying again.

Spent all weekend cleaning driveway and patio. very pleased with the results the monoblock looks as good as new. Thanks for that

Great product as patio had not been properly cleaned in years. Very strong smell when put on , left for 3 hours then washed off. This removed most of dirt/marks. Some blackspots still there but much less noticeable. Still need to try it neat on the spots but have not had time to do it yet

Got to be honest after reading the reviews I thought this would be just what I needed. I have 15 sqm yorkstone patio. I used it as the instructions in its highest concetration, for 12 hours. I kept the patio damp the entire time. And pressure washed before hand. The patio looks no different at all, literally no different.

Can’t recommend highly enough, amazing results!

If you dilute 1;1 you will get 40m2 coverage, not from a watering can. Diluted 4;1 and product did the job so well satisfied.

I was a bit disappointed with the product I followed the instructions and my patio pavers are definitely cleaner than before. However it not remove the blackspots from my patio pavers.

Got patio a lot cleaner than it was but still left a couple of stubborn marks. (This may have been down to the way my husband used it!)

Highly recommend. Does exactly as it promises. Took hardly any time or effort. Will be ordering more for another patio of old crazy paving.

Great product, easy to use with great results.

Excellent product my patio looks like new������

A brilliant product, the previous Blackspot remover that I had used for a few years has changed their formulae and not so good. I tried Smartseal, absolutely brilliant, I used 25 litres on a very large patio area for a customer and have ordered a further 25 litres for other customers now. Left it on for an hour or so, kept it wet so it did not dry out and then pressure washed off, very very happy customer.

Brilliant product. Brilliant advice from sales staff

Excellent

Works really well black spot and white spotted areas - just be careful about splashing and the run off when you rinse it off, it's very strong stuff.

Bought it to try and get rid of the black spot on clay pavers. Used it with a garden sprayer, diluted one to one. Sorted out the black spot, the blocks came up like new!

I was apprehensive about spending £35 on patio cleaner having bought a few before that have been pretty much useless. The patio gets cleaned every year with a pressure washer, but it never looks all that clean. This product has changed that. 7 years of mould and black spot gone in a couple of hours with no hard labour. I would not hesitate to recommend this, or buy it again. Used on Indian sandstone, which looks almost as good as new after one application!

This is one of the best products I have purchased. Removed all black spots and has cleaned all the patio and block pavers. Brilliant.

This product worked very well except for white spots on the stone paving . It probably helped as they where removed easily afterwards with a power washer.

I have tried multiple cleaners in the past 10 years and nothing has worked as well as this product. I would highly recommend it!

Great product. Removed blackspot from patio that was virtually covering every flag. Easy to apply with a sprayer. So pleased have ordered more for block driveway to remove unsightly black spots that no amount of pressure washing will remove. Customer care are first rate with this company. They answer queries promptly and are so helpful.

I was a bit worried to use it but am over the moon it’s cleaned old and just layed Indian rainbow sandstone up a treat . Will be buying more would highly recommend this product

worked well, cleaned better than power washing. Didn't entirely get rid of black spot

Needed to use more of the solution that first hoped, therefore the amount I had to spend to clean my whole patio was significantly more than I first estimated, however the solution did work well although some power washing was still required to remove all the algae etc.

We had got a quote for £150 for a professional to clean our patio which we thought was rather steep.. so we decided to do some research and do it ourselves. My husband was sceptical about getting out the black spots as he had tried everything, including buckets of bleach and pressure washing regularly. Nothing got rid of them. We put this product on and left for a few hours in the rain. When we washed it off, all the mould, lichen and black spots were gone. We are really pleased with the results. Won't use anything else now. So much quicker than pressure washing, to be honest I can't believe we wasted so much time doing that in the past. Might as well throw out the pressure washer now!

Excellent product, best on the market 5*****

Fantastic. Got rid of all black spot. Wear protective clothing.

Brilliant product.

Superb product! So easy to apply, and you can see the black stains bubble and vanish very soon after application. No back breaking scrubbing required. Would highly recommend.

concrete drive had a lot of black spots, got most of them, of pleased with the result

Brought natural sandstone slabs up like new! Bit expensive but would definitely buy again.

Very pleased with this patio cleaner. I did have a bad old patio riddled with blackspot and this cleaner removed them 98%. I now have a very clean and rejuvenated patio. An excellent product and I thoroughly recommend it.

Quick service, well packaged. The patio cleaner worked a dream, I now have an Indian Sandstone patio that looks as fresh as the day it was laid. Will definitely use again if necessary.

Finally a product that does exactly what is says. Our Indian sandstone patio looks like it did years ago when new and black spots gone .Block paving driveway the same . Definitely using again next year worth the money .

Great product. It really does work!

First Class product. My Indian Sandstone patio had been left a mess after the winter and was covered in algae and blackspot. I was sceptical about the claims of how easy it was to use but was pleasantly surprised, I cleaned a large patio in a day and without any aggressive pressure washing. I finished the job with Natural Sandstone Sealer. I would definitely recommend.

I was amazed at how well this patio cleaning fluid worked. It removed dirt and black spots very easily and my patio looks as good as new again. Very impressed!

Very impressed with the product - Patio Cleaner Xtreme60 - and with the service provided by SmartSeal. Mandy, who I spoke to on the phone, was particularly helpful in ensuring that I received my order the following day.

Excellent product, this is the 3rd year running we’ve used this. Gets rid of all algae, black spot, and general winter grime. lasts for a year. No effort to apply. It’s amazing! Definitely recommend.

Absolutely brilliant for removing black spots on your patio, with not a lot of effort required. Only took one application to remove the black spots

Amazing!!! I’ve been pressure washing my Indian sandstone patio for years with varying degrees of success. This year it just didn’t seem to be coming clean and the black spot was covering everything. So I resigned myself to the fact that it was probably new patio time. I’d used some heavy duty disinfectant in the past which worked at cleaning up the stones and getting to work on the black spot but I was concerned about the damage it may do to the stone. So as a final attempt I searched online and came across Patio Cleaner Xtreme ... not cheap but I thought i’d give 5 litres a go. I was amazed at the results - you can see it working so can decide when is the right time to wash off. I initially diluted as directed but it didn’t clean the bad areas so put it on neat and repeated a couple of times .. I now have flags which look like new instead of being completely black!!!! I found the best way to apply was via a garden sprayer and then I could control how much to put I and where. Not sure this is particularly environmentally friendly looking at the reaction of our garden worms but does the job. Have some great before and after photos ...

Absolutely brilliant , smells initially but worth it Patio looks amazing

Good product but best applied by spray if there are spaces between the slabs. Watering can is uneconomical as so much is lost!

Fantastic service. Delivered promptly followed up by a very courteous e mail. The product is totally amazing. We were going to be digging up our patio and replacing it, but no need to now. It is like new. Wish we had found this product sooner. Many thanks

Got a lot of general grime off but only about two thirds of the black spot probably have to use it without diluting to get the best result

Works very well ....much easier than jet washing

I can't quite believe it! I've had black spot slowly creeping over my whole driveway for years. Jet washing didn't remove it, bleach didn't remove it, masonry cleaner didn't remove it but this did...and easily. Followed the application instructions and just rinsed it off with the jet wash, worked brilliantly. Worth every penny.

Very good product ...in fact so good I have ordered another one

Really good product with a terrific end result

Pleased with this product. Needs a couple of applications or more to get rid of black spot

Bought this as our patio had spreading Lichen. No amount of jet washing would remove it. Tried this cleaner, I wouldn’t say it was even very manual to brush in. Woke up the next morning, it was all gone. I am amazed, it is completely worth it. Will use this every spring to get our patio fresh. Have recommended to friends.

My patio is the cleanest it's ever been and I was amazed at how easy it was to use with such little effort

Very, very, pleased with this product. Our patio has been laid 8 years and despite regular pressure washer cleans ( 3 times a year) it had a lot of black marks on it , green mould and it generally looked awful. We bought a new very powerful pressure washer and it didn’t improve things. Then we Googled black marks and found this product ... it’s looking great now , 95% of the black marks are gone and all of the green mould and we are just annoyed that we bothered with the pressure washer upgrade.

Dear Sir, I laid a 75 square metre Indian sandstone patio at the rear of my house some 15 years ago and for years I have maintained it with a pressure washer. However, whilst successful, this has also caused problems with the mortar joints which have constantly required maintenance. The last few years have seen a gradual increase in black spot lychen which has resisted every product (including bleach I’m afraid) I’ve used to try and remove it. Two weeks ago I realised that my once lovely patio was no longer something of which I was proud, and worst of all, the thought of endless hours of power washing etc with possibly not a great deal to show for it at the end, was truly dispiriting. I then found your Smartseal video on the internet and decided to give your Patio Extreme product a try. I completed this two hours ago, using two of your 5 litre bottles, and the difference to my patio already is quite remarkable. I truly was not expecting too much but the result looks outstanding. I just wish I had taken a photo of it before cleaning to show you why I’m so delighted. Thank you. Your product has saved me hours of hard work and my patio has been restored. I will now seal it and hope that your natural stone sealer will as good as the cleaner. Yours faithfully, Michael McEvoy

Have only cleaned a small Marshall’s garden wall so far really good results.

Great product cleaned 3 large patios very impressed also with the service delivered 2 days after order also checked with me that address/postcode were correct . Thanks

Tried this product on paving slabs that were heavily soiled including black spots. Applied it neat and it did a really good job and although it did fail to remove 100% black spots the slabs have been aesthetically transformed. Have now purchased a larger container to do the back garden

Sprayed onto limestone and never had to do a thing. Instantly the dirt and stains were removed. It's excellent and so easy to use. So happy!!

fantastic product, well worth the purchase.

I've tried every product to clean my concrete yard and came across this product on line so thought I'd give it a try wow! fantastic and the concrete looks great cleaned all the algea and stubborn black marks and moss fantastic can't rave enough about it thankyou

I have my patio back! Remarkable result, it looks really good. Now I can stay on top of it and keep it this way.

First class cleaning product.Eradicated long standing black spots on my patio pavers leaving them looking like new. Easy to apply but note to follow carefully the application instructions.No need for high pressure washing.

Applied the solution to a very grubby patio,washed it off and looked better than when first layed,thank you

Takes all the misery out of patio maintenance Just spray on and it comes up like new

Great product! Would highly recommend to use this cleaner on natural stone products

Excellent service and product

This was the only product that I found that brought the Indian Sandstone on my Patio back to the condition it was when it was laid 10 years ago. The original colour was totally obliterated and it had a lot of black spots. I did it last year and finished it with a Smartseal's natural stone seal which has meant it is still a good colour and is cleanable with a good hose down.

Really great product. In the past we've pressure washed, and scrubbed the patio and nothing has cleaned it, so we left it for a few years. I spoke to Smartseal and they recommended this product and it does exactly what it's supposed to do, patio like new again.

Quickly removed the majority of stains on first application. Black spots removed from concrete slabs on second clean. Amazing transformation of a very tired and dirty patio. Highly recommend this cleaner. Well worth the small extra cost involved

This is a brilliant product. This is our second year of using it and we needed so much less this year as the patio had not got anywhere near as dirty as in the past. Invest in a sprayer and it goes a very long way. I am extremely pleased and would recommend this product to anyone with a "black" patio.

Easy to use, does a great job and the patio has come back to life. Many thanks.

Really good product. In the past we've pressure washed, steam cleaned and scrubbed the patio and nothing has cleaned it. This product does exactly what it's supposed to do.

Worked very well without any scrubbing. Power washed first, but patio was still 'grubby'. Applied cleaner next day and slabs became 'original' clean while I watched.

Customer is over the moon with the job I did thanks to the smart seal products A++++

Excellent product, got rid of all the black spot that the Karcher couldn't reach!

Excellent patio cleaning product. Finally found something that does what it promises.

this patio cleaner is a fantastic product and so easy to apply! after only 1 hour, 90% of black spots had disappeared this has taken all the drudgery out of patio maintenance many thanks

Used this product on some Sandstone Window Cills and was very impressed. The product started to remove the 'black spot' & dirt without the need to even agitate it. Recommend this for those stubborn stains.

Amazing - works like magic. 10/10 & thanks for the telephone advice before I purchased

Extreme x for black spots worked a treat arrived next day 10 out of 10 Colour enhance and sealant worked a treat very good really happy with result 10 out of 10

Great product got all my black lichen off, my stone patio is like new.

A very effective product. I used a watering can with a rose with large holes so probably used up more than I needed to. A fine rose would be useful. Well worn slabs now look as new.

Can't tell you how good this stuff is if only had the opportunity to upload before and after pictures Offered to clean a friends patio as a start to my business the difference is amazing they are so pleased with the results as am I.

Great product for very little work watching it remove black spot/lichen before your eyes is very satisfying goes along way when applied with a sprayer.

The patio cleaner said 'powerful' and it certainly was. It got most of the lichen off but the difference it made to the colour of th Indian Stone was amazing. I should really have ordered a larger tin but having tried other products in the past and finding them to be useless I did not want to risk buying a larger quantity. As it happens I need not have worried, it is very good. Delivery time was quick.

I used the Patio clean Xtreme 60 on my Indian stone patio and I'm delighted with the results. Not only did it remove the black spots but brought the colour back too. Best Regards Martin Warner