Patio Black Spot Remover For Artificial Stone

(5 customer reviews)


For use on Manufactured or Artificial Stones such as Marshalls, Bricks, Bradstone and Haddon Stone. Will also work on external marble, all cementitious based and all pre cast patio slabs.
4 Litres: Maximum Area: 18 square metres.
2 Litres: Maximum Area: 9 square metres.

SKU: ART Category:


  • Supplied in liquid form, ready for use.
  • Pour into a 5L or 7L Hozelock garden pneumatic sprayer.
  • Biodegradable.
  • Coverage – not exceeding 5 SQM per 1L.
  • Dwell time: leave for 2 hours. No need to scrub.
  • Remove using a pressure washer with a fan jet (Vario).
  • Kills all forms of organic growth including green and red algae, white fungi, black spots and moss.
  • Available in 2 and 4 litre containers.


Patio Black Spot Remover is currently the only product developed specifically to remove those hideous black spots and restore the colour of your stonework. Patio Black Spot Remover for Artificial Stone will remove black spots from garden ornaments and all pre cast patio slabs including Marshalls, Bradstone, Haddonstone and other cementitious based slabs. Coverage rate is based on a patio that is 3 years old. The older the stone, the more treatments required. Carry out a trial slab to determine the coverage on your stonework.

To maintain your garden stonework and stop the return of the black spots, buy and apply our Patio Black Spot Preventer annually. This will kill any black spot spores before they have the chance to germinate and turn into spots and will also remove green algae without the need to power wash!

Reviews (5)

5 reviews for Patio Black Spot Remover For Artificial Stone

  1. David Ford

    Very pleased with this product and the excellent service and useful tips received from Simon. My patio now looks as good as new where previous attempts at pressure washing alone couldn’t shift the spots. Highly recommended.

  2. Delia Coburn

    I purchased the Patio Black Spot Remover for artificial stone and was totally satisfied with the results. I’m in the process of buying some more for the drive.

  3. Norman Grunbaum

    I don’t know what is in that stuff but just to say it does work. Our garden is looking great again.

  4. Michele

    Came across an advert for this product in a gardening magazine, the results looked amazing. As I was looking at replacing my patio I thought I would give this product a go. I followed the instructions and although I hoped for the same results as the the web site and magazine showed I was a bit sceptical. Well I am absolutely delighted with the results, my patio really does look as good as new! This product is amazing and I will recommend it to anyone with a black spotted hideous patio! It really does transform it into a lovely like new patio, fabulous, can’t praise this product enough…. over the moon with the results.

  5. Julie Hemsworth

    Was very sceptical and hesitated to buy this expensive product but all else had failed and the only remaining solution was a new patio as over the past two years the black spot had become worse and unable to be removed by power washing. We did this as a DIY project and although it had to be power washed well before and after treatment I was delighted with the result. As the sun was drying the patio it became clear that this product really does work!

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Shipping & Delivery

Shipping costs for mainland UK is £3.99 + VAT. Goods will be delivered within 3 working days maximum by DPD. Once your order has been prepared for dispatch, an SMS and email will be sent advising you of a 1-hour delivery window.

Please examine the goods on arrival, prior to signing for delivery. If the goods are damaged, please reject the delivery and report to the office immediately. The product and storage is your responsibility once signed for. Store upright, in a cool, dry place, away from direct sunlight.

Shipping to Guernsey and Jersey is £20+VAT. Shipping to Isle of Man is £30+VAT - Allow 7 working days. Shipping to Ireland is £25+VAT. Shipping to France, Germany and Spain is £35+VAT - Allow 10 working days.



Prior to use, pressure wash the area to remove any surface dirt and loose debris. It is important the Patio Black Spot Remover comes into direct contact with the surface of the stone and the black Spots. Any surface dirt will reduce the effect of this product.


A dry overcast day when rain is not forecast is ideal. The product works when wet, if it dries too quickly the performance will be reduced.

Ensure this product does not come into contact with fabrics or furnishings.


  1. Use neat – DO NOT DILUTE – Pour our solution into a pneumatic garden sprayer. (A ‘Hozelock’ 5L or 7L sprayer is recommend. Do not use a hand sprayer.) Pressurise the sprayer.
  2. Apply the product to a dry surface, as a fine mist and saturate the surface.
  3. If you have not used the product before. Treat just one slab first. The older the stone, the more treatments it will require. The product will remove every single last spot. By completing one slab first, this will give you an indication of how many treatments your stone will require. Only when you have removed all the black spots from the first slab, continue with the rest of the area.
  5. Once applied, allow to cure for a period of 2 hours.
  6. Remove using a pressure washer, ideally with a minimum flow of 7 litres per minute. Use the fan jet attachment to sweep the dirt away. Other attachments such as circular spinning attachments will not give you the best results.
  7. Any black spots that remain, simply retreat (when the surface is dry) allow to cure for 1 hour then wash off.
  8. Repeat this process until no black spots remain.
  9. Apply the Patio Black Spot Preventer 12 months later. Do not seal the patio.

Exceeding the recommended coverage rate will reduce the performance of this product. Coverage will vary depending on surface porosity and profile, e.g when treating sloping areas or riven surface, beware of surface run off and retreat as necessary to ensure correct coverage.

The Patio Black Spot Remover is quickly and readily biodegradable. The effluent if washed into soil, flower beds or lawn will breakdown rapidly. This product will not affect surrounding lawns or foliage in diluted state. Keep animals and unprotected persons off the treated area until dry.

Ensure product doesn’t come into contact with skin, eyes or respiratory tract. In the event product does comes into direct contact with the body, immediately rinse with water.