Patio Black Spot Remover Patio Cleaner for Natural Stone - Indian Sandstone, Limestone, Yorkstone - for Black Spots, Lichen, Green Algae and White Fungi - Restore Natural Colour - Biodegradable - 4 L

After several years the beautiful Indian sandstone in my garden has been getting harder and harder to clean. I have to put the pressure washer on full blast and go over the flagstones bit by bit. It's a grueling process and even then, the results still weren't great, especially the areas of black spots and marks left by pots. The lichen and green algae seems to come back quicker and quicker the older the flagstones get.But was it really going to be worth spending all that money on this black spot remover, plus a sprayer? In desperation I tried it on the paved area nearest the house. It comes neat so it's very easy to use — just tip into the sprayer, pump and spray. I did the trial they recommend, which is to really saturate one flagstone and spray the one next to it more lightly to see how much you need to use. The answer was, saturation, so I'm in for quite a few bottles but I no longer care.As soon as I sprayed it on, the green disappeared. The lichen turned red, then pale yellow. After two hours, which is how long you're supposed to leave it on, there were no black spots, a stain (red wine?) had disappeared, and there were zero plant pot marks. I washed it off with the medium setting on the pressure washer, which took hardly any time at all. No painstaking blasting, in fact barely any effort. My flagstones look like new. Best of all, I can tackle a small area at a time (they say it's best to do this anyway) and tidy up/rearrange my pots as I go. Yes, it's worth the money, and I already plan to use that sprayer for some other tasks.

First time reviewer for anything here in damp N Yorkshire. Moved in 7 years ago and found a neglected patio. Cleaned this and paved paths x 2 per year with my trusty (old) Karcher. Gradually the black and white spots have taken over. Researched it to death looking for something that doesn’t kill the vegetation but will get rid of the spots. Purchased 1 x 4 litre to test it out. ABSOLUTELY AMAZING result. The area done has new paving slabs and a few black spots remain which I will return to as I ran out of the stuff. The next test will be the very old paving slabs when my next order arrives. I will return to this review and report on the vegetation and old slabs. It is relatively expensive but well worth it I think. By the way…. WEAR OLD CLOTHES! Hope this is useful to someone!

Great product cleared our black spot

This is an excellent product and certainly cleans up paving slabs from blackspot and other marks. I would ave given 5 stars but the price seems very high and to clean all our pathways would cost a considerable amount. #Would use a lot more often if a lower price

I have to be honest, I waited about a year after seeing the ad for the first time as the Patio Black Spot Remover (PBSR) was so expensive. My wife was extremely sceptical - I’m apparently a bit more easily sold. Anyway, the first photo shows the patio in March of this year - I had to find something to do in the lockdown - and gives an idea of the state of it even after jet-washing.I normally jet wash it each spring but hadn’t done so last year because my builder did a brilliant job of properly pointing it which the people who laid it seven years ago hadn’t done and I wanted it to harden before attacking it with a KarcherAnyway, quite honestly it still looked really lousy in March after pressure washing - as you can see, it’s really not easy to discern much colour in the slabs and there was a lot of black spot.Eventually, I gave in and bought 4 litres of PBSR being careful TO BUY THE RIGHT ONE for the variety of stone we wanted to use it on. I bought a Hozelock pressure sprayer and followed the instructional YouTube video from the PBSR company. We were amazed at the results - although horrified how little 4 litres actually covered. In fairness to them, they did say that the older the sandstone is, the more porous it is and the more fluid is required to get the job done.I bought more of the stuff and two days later went to continue. The Hozelock spray nozzle disintegrated! Folks, you really do need to flush this stuff out of your applicator after you’ve applied it - it’s really powerful.The second photo gives an idea of how remarkably effective PBSR is. You really can believe the claims as far as Indian Sandstone goes, anyway.Incidentally, I emailed the manufacturer about their Black Spot Preventer fluid - not the same stuff - and got a very quick and detailed reply from them. I will apply that in the spring, I think, and I’ll write a separate review. Meanwhile this stuff is great. Expensive? Sure. But cheaper than a new patio.BTW - do wear old clothes.

I pressure washed first, let it dry, then applied patio black spot remover for sandstone, then pressured washed again after 2 hours. I am really impressed by the end product, the only reason I am giving 3 stars is that it removes everything except (weirdly) black spots. I think the mistake I made was to apply in sunshine, but there was nothing in the packet or online FAQs to tell you not to do this (they do mention it in a hidden away youtube video).Docked 2 points because they should make that point clearer. The product has effectively doubled in price as I'm going to have to re-treat again. Had I known this I would have got better results.That being said, I am really happy with the results. Just not a complete removal of black spots, which is what it promises

I like it easy to use makes the patio look new just right for summer

Second time I've bought this product and it is very effective on my York stone. Better than others I have tried in the past.