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since 2008
Product Reviews
By Becky W

I tend to be a bit cautious of reviews, but it definitely did the trick on an elderly patio and front steps, and the algae, green gunge and most of the black mold has gone. Very impressed with the result, and no need to pressure wash. The only caution is just how strong and bleachy this stuff is and to be mindful of eyes, skin footwear and clothes!

By Mike Gravestock

Your products do what they say, cleans block paving and patio slabs like new, do not even have to jet wash. Well done.

By David Baxter

have used in the past for cleaning pavings and even masonry and render walls; worked well and totally cleaned and thats why i have bought again; i used it neat

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

(5L & 25L Available) Powerful Concentrated PATIO CLEANER, Removes, Algae, Dirt & Blackspot. 5 litre treats 40 m² Removes Algae, Black Spot, & Lichens fast, Sandstone, Natural Stone, All Paving

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Visa Electron
Product Description

Powerful and Effective Patio Cleaner

Remove black spot from block paving, concrete or natural stone on patios. *Not recommended for use on Tarmac*

PatioClean Xtreme is a fast acting, high performance patio cleaning product, with four powerful active ingredients. PatioClean Xtreme offers the simple way to keep any patio clean often avoiding the need for pressure washing. 

  • Simply dilute 1:1 and apply to a wet surface by watering can or sprayer.
  • It is important that the patio remains wet for 1 hour. 
  • Then wash away with water from hose or pressure washer. For areas of heavy soiling, scrub into surface or re-apply.

PatioClean Xtreme is a powerful cleaning product, which cleans & helps to slow down future contamination.

For Removal of

  • Black Spot
  • Algae and Lichens
  • Moss
  • Surface Grime

5 litres of product will clean and treat approximately 40 m of flagstone, natural stone, or block paved patios. Wear appropriate safety wear at all times. see technical page for more information.

Product FAQs

Q: Hi can this be used to clean moss of garden walls, how would you dilute the cleaner I:E What Ratio Regards Ron Hogan

Ronald Hogan

A: We would recommend our Green Clear product for this purpose, a 5-1 ratio should be very effective. Hope that helps.

Response from Nigel

Q: Will this clean and not detrimentally affect easy joint mushroom coloured grout which is going black?


A: The patio cleaner contains no acid based ingredients that would harm the resins in the pointing grout, many customers have used it successfully for this purpose.

Response from Nigel

Q: Hi, is this One Pet safe, for dogs please? thank you


A: Like any cleaning product, you wouldn't want pets on the area whilst the Patio Clean Xtreme is wet, but once washed off and dry, it would not be harmful.

Response from Ricky
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  1. Sweep away loose debris & areas with a heavy build-up of dirt & grime.
  2. Wet surface area with water.
  3. Dilute Patio Clean Xtreme at a ratio of 1:1. If removing black spot, don't dilute (use neat).
  4. Apply product to surface using a watering can or sprayer.
  5. Make sure that surface area doesn't dry out before rinsing off.
  6. Leave on surface area for upto 60 minutes.
  7. Rinse area with water.

It is important the patio remains wet throughout during 60 minute period, as the product becomes inactive once dry. Most ingrained organic matter and grime will be removed after one application, but sometimes a second application may be required to remove all black and white spot algae.

Health & Safety

PatioClean Xtreme contains chlorine as an active ingredient and will stain fabrics and sensitive materials. Take care to avoid contact with fabrics during application. Toxic to aquatic life, wear protective gloves and goggles at all times. Patio Xtreme can cause skin burns, avoid contact with eyes. Keep out of the reach of children



We provide a national delivery service for our block paving sealer, pattern imprinted concrete sealer, roof coatings and tarmac restorer on a standard 2 - 4 working day basis. Dependent on weight, this is normally done by pallet or parcel carrier.

If you need products delivered quicker, for a small additional charge, orders placed before 1.30pm can be delivered within 1 - 2 working days to most parts of the UK, although this is dependent on the courier service in your area and the product/s ordered. If you require this service, please check on area availability by calling 01268 722500.

Our commitment is to supply all orders as placed and we offer a comprehensive guarantee of quality. Providing a reliable delivery service to all our customers is most important to us and this is backed up by the many satisfied customer testimonials we have received over the years.

If you need an order delivered to a different address, left somewhere at your property without a signature or left with a neighbour, just let us know.

We also try to maintain 100% stocking levels of our products at all times, so an immediate despatch is virtually guaranteed.

Our product returns policy can be viewed by visiting our Terms and Conditions section.

*Free delivery on orders over £75 are subject to the delivery address location.

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