Patio Black Spot Remover Patio Cleaner for Artificial Stone - Marshalls, Bradstone, Cement-based Slabs - Black Spots, Lichen, Green Algae and White Fungi - Restore Natural Colour - Biodegradable - 4 L

It cleaned off the black marks fairly well from garden paths and window sills but left white ones.

We had seen this recommended as a treatment to bring ageing patios back to life - and it certainly doesn't disappoint. It's not cheap and if have a large patio or drive you must bear this in mind however it is a lot cheaper than replacing them. We used three cans on the patio and honestly it looks brand new. Bought a fourth one to do the drive. Marvellous product.

I have tried a number of products to clean our twenty year old patio paving. Nothing removed black spots as good as this product. But it is expensive . Warning - Don't let the spray get on your clothes

The product certainly restores the patio stone to near pristine condition. For severe black spot make sure the surface is completely dry and then leave to cure for at least 2 hours or longer before before washing off. Plan another job for the full 2 hours so you are not tempted to remove it too soon!! Best to plan ahead when using this one!!

did not do a very good jpb

Excellent product. Does what it’s says on the tin!

It seems to be the only thing on the market that works but I only have a tiny patio and it has taken 6 litres so far and is still not completely clear, so it is not cheap. But there is a definite improvement if you are willing to pay.

It works like a dream but I needed more of it, so it worked out really expensive, although not as much as a new patio!