Pro-Kleen Ultimate Black Spot Remover and Destroyer for Patio, Stone, Block Paving, Indian Sandstone, and more. Easy to Use Fluid that Powers Through Stubborn Dirt & Grime (5 Litres)

This stuff is absolutely fantastic. It removed black spots from patio that have been there for over ten years. I think if I had been able to leave it on overnight it would have even taken some of the marks the spots left here and there, I have a cat though and it was hard work keeping her off for a few hours. She is 18 and if I lose her, which I will one day, i’ll do them again and then seal the patio. Well worth the money, nothing I tried before even touched them.

Works incredibly well, not the cheapest product out there but my patio looks almost brand new. It’s easy to apply but just be wary of the clothes or footwear worn as it did bleach my top (old one because I knew I was going to get grafted) removed almost every trace of the lichen mold despite it not having been treated in a couple of years. Will 100% be buying again.

After jet washing my slabs, which I do every year, I found that this year for some reason they were particularly covered with black spots and lichen that just wouldn't shift. I found they looked so bad afterwards that I wanted to try something else to get rid of the marks. I came across this product, and thought I'd give it a go. I'm not easily impressed and I wasn't expecting miracles, but I have to say it's done a pretty good job. It's easy to use, just transfer to a pressure spray bottle. I left it for about 3.5 hours then jet washed it off. The only downside to this product I would say is the smell, it's so strong, it burns your eyes, and you can smell it down the road, but it is a chemical so only to be expected. As you can see from the picture, it hasn't completely gotten rid of the black spots, but it has reduced them greatly. It completely removed the green and white lichen and overall the slabs look so much better than they did before. Would it have worked better if I'd have left it on longer? - I don't think so. I might try it again to see if it will completely remove the black spots, but I need a few months to recover from the fumes first. Overall, I'm pretty impressed with this product and would recommend it.

Recently jetwashed our patio. Noticed lots of black spots which the jetwash would not remove. Just like you probably did to get here, I googled "patio black spots" and found out that it's probably lichen. So I looked for products to remove it. And found this. £35 seemed a bit steep, but the reviews looked good on the whole, so I bought one. It arrived quicker than expected. It doesn't smell that strong. It gives off a mist, and is clearly pretty corrosive, so you don't want to stick your head in it and get a good lungful, but suffice to say, the smell is not overpowering. Don't get it on your clothes. I splashed some on my shorts and it's bleached them. Was careful not to get any on my skin, but you probably want to avoid that as well. "But does it work?", you ask. Yes. Yes, it does. Check out the photo. I had some areas (shady part of patio, doesn't dry quickly) which were heavily black spotted, and some which were less affected. I did 3/4 of our patio with the first bottle. That was the less affected bit. It looks like new. Then I ordered a second bottle to deal with the rest of the patio. That's when I took the photos attached to this review. When you apply it, the bits in contact with any lichen start fizzing white, which you can see in the middle photo. I may need to give some parts a quick second blast, but the difference is amazing. Before, it was dark and grim looking. Now, it's really shiny. It's brightned up the house, as more light is reflecting in from the patio. So, yeah, I would really recommend this product. It does say to jetwash it off after a few hours. Two things there: 1. I just used a hose and 2. Most of the lichen seemed to have gone within a few minutes, so I'm not sure why you need to leave it on for hours.

I've tried a few other "miracle" workers over the last couple of weeks, so the first picture is after I've already used several things, so originally the lichen was even worse! (Moved in to a house with a patio that likely hasn't been looked after in 17 years). I wasn't expecting too much from this, in fact I was pretty much ready to admit defeat but this was my last attempt at getting rid of the lichen or fading it some more. Well, wow, just wow! The directions say to leave it for at least 2 hours, I've left it for about one because my animals were getting impatient, so needed to wash it off and let it dry, so just about an hour and the lichen just disappeared, it started working really quickly, like surprisingly quickly, within minutes I saw it fading in places. There are still places which I clearly didn't cover properly so will need a second go and some of the more stubborn lichen has faded considerably but not fully, but I was not expecting results THIS amazing. If you've just discovered lichen and it immediately became your arch enemy, look no further, this stuff will help you get rid of it at last! Hoping to never see lichen again, but if I do - I'll be back for more!

Basically expensive bleach

This is fantastic stuff. I wanted to clean a very old crazy paving doorstep which had lots of black spots and marks, I did have to apply it 3 times but the result is brilliant. On the newer patio flags one application was all it needed. Would definitely recommend.

I recently used the Pro-Kleen Ultimate Black Spot Remover and would give it a solid 4 stars overall. It’s a powerful product that really delivers when it comes to tackling stubborn black spots and lichen on patios and paving. One of the biggest positives is how effective it is. After applying it with a sprayer and leaving it for a few hours, I could already see the black spots breaking down, and once rinsed, the difference was very noticeable. It genuinely brought tired paving back to life, which is exactly what you want from a product like this. It’s also straightforward to use—no complicated mixing required, just apply, leave, and rinse. The coverage is decent too, so a single container goes a long way on medium-sized areas. Overall, this is a very effective and easy-to-use black spot remover that saves a lot of time and effort compared to pressure washing alone. With a bit more gentleness on surrounding areas, it would easily be a 5-star product.