Free Delivery
On Orders Over 75*
#1 Top rated cleaning supplier
on trustpilot
UK Manufactured
since 2008
Product Reviews
By Ray Southwood

First Class Product cleared 99% of the Black Spot on my Patio would recommend SmartSeal Black Spot Remover

By Raymond Southwood

This Black Spot Remover is the real deal it cleared most of the Black Spot after one hour GREAT PRODUCT

Wish to leave a review?
Write a review
Your Rating:
* All submissions will be checked by our administration team before appearing on the site. Please be patient as we will try and approve your comments as quickly as possible.

Xtreme Black Spot Remover (5L & Bundles)

Powerful Patio Black Spot Cleaner for Natural Stone, Block Paving & Paving Slabs

In Stock
Visa Electron
Product Description

A high-performance black spot remover for cleaning black spot, lichen and mould from block paving, concrete paving slabs and natural stone patios. *Not recommended for use on Tarmac*

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

  • For best results do not dilute; apply in temperatures between 5 - 20 C
  • 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.

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

For Removal of

  • Black Spot
  • Algae and Lichens
  • Surface Grime

5 litres of product will clean and treat approximately 20 m of flagstone, natural stone, or block paved patios. Wear appropriate safety wear at all times. see technical page for more information.

Once opened use within 3 months.

Product FAQs

Q: Can this be used on Indian sandstone?

Victoria Munn

A: Yes, our Xtreme range has been formulated to be used on natural stone, so the Xtreme Block Spot Remover will do a great job on your sandstone.

Response from Reece

Q: My patio is surrounded by grass. Will washing it off kill/damage grass and plants?


A: As per the application video, if you wet the susceptible areas with water before and after use, the Patio Xtreme will cause no harm to grass or plants.

Response from Ricky
Ask Us A Question
Send us a question


  • Brush off any dirt or loose debris from the surface
  • Lightly dampen area with water
  • Apply NEAT using a watering can or sprayer (do NOT dilute)
  • Work in by brush or stiff broom
  • Make sure that surface area doesn't dry out
  • Leave on surface for 1-2 hours before rinsing off
  • Rinse area with water or use pressure washer if available

It is important the surface remains damp during application, 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. If a second application is required, leave to dwell on the surface for a longer period (2-3 hours) before rinsing or pressure washing off.

Health & Safety

Xtreme Black Spot Remover 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. Xtreme Black Spot Remover 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.

Share this product