SmartSeal Patio Cleaner Xtreme - Powerful Easy To Apply Patio Cleaner Fluid - Highly Concentrated Patio Black Spot Remover and Paving Slab Cleaner - Eradicate Stubborn Patio Black Spots (5 Litres)

Thought I would try this and was very impressed with the results! Much less effort and mess than pressure washing. Left on for just over an hour. It is expensive but well worth it, would definitely use again and recommend to others.

Would highly recommend this product. Cleaned patio effortlessly. I shall be ordering this every year. Patio looks brand new!

We had black spot on our Patio and the Liquid was fantastic. It didn’t get rid of it completely but it improved a lot. Would recommend.

Great product so much better than Patio Magic which did not remove the black spots.

Pricey but it works, patio looks like new

This really worked on my Indian sand stone patio. I did have to repeat the process but that’s because they were really bad. It’s easy to use. Just spray on after mixing 1:1 with watering can or sprayer, I scrubbed a bit with a stiff broom and left it for 2 hrs…I could definitely see a difference but I decided to repeat and they’ve come up lovely. Very pleased.

Really good does what it says on the tin or plastic container in this case

Cleans well if you apply it neat or with a small amount of water. For my average sized driveway I would need many of these containers to clean it fully so it's not value for money. I have managed to clean only half, would now be going for a cheaper option at a third of the price, which does about the same and hasn't got such a strong smell.