SmartSeal Patio Cleaner Xtreme - 5L - Powerful Black Spot Remover Patio Cleaner & Rapid Mould Lichen and Algae Remover for Cleaning Stone Paving, Concrete, Sandstone, Porcelain, Slate & Granite

WOW!!! This stuff is absolutely amazing. If you need a patio, block paving or wall cleaner then look no further. So effective, extremely easy to use, excellent results in minutes. This product is unbelievable. Our block paving was filthy with years of dirt ground in but the results are stunning, honestly’! And our walls are transformed to new looking. Fantastic 5 star

Used product on concrete slabs that had not been cleaned properly for many years, a 1 to 1 solution was applied and scrubbed in by hand. On leaving for 2 hours I then rinsed off and gave a light scrub. Although results were good there was still a few marks left so I jet washed surface and was super pleased with the results, not a single spot or blemish to be seen, having tried jet washing only on similar slabs around the property these results were far superior.

It is really convenient to use with mild smell. I only used once and it cleared the moss immediately while the black spots partially cleared. May be it needs a few times cleaning at a later dates to see the big difference.

Really impressed with the finish. I used a watering can which in hindsight may have been excessive. No issues with the results, but it used a lot of the liquid, so next year I will try a sprayer. Wish I had taken before and after photos as it was more effective than jet washing. I should have worn Wellies though, as the splashing destroyed the colour of my jeans. Thankfully they were my pair I wear for working in the garden anyway!

THIS STUFF IS FANTASTIC! Would 100% recommend. I used it on patio slabs and it was so quick and effective. It didn’t get rid of the black spots (but I think the product says it doesn’t do that). Went over it again with a pressure washer. I would recommend that you buy more than you think you need. 1 bottle wasn’t enough for my patio.

This stuff works brilliantly Just be careful what you wear Only needed one application on drive which was really dirty and it's come up like new .was dark and patchy And now looks bright and clean

The product was easy to mix and spread using just a watering can. We had 86m² to clean so we bought three 5l containers. At *up to* 40m² per 5l that should have been plenty. Unfortunately we used the whole lot and only covered about 60m². Looks like the phrase 'up to' is doing a lot of heavy lifting here! Our experience was 20m² per 5l. The good news is that used diluted 1:1 as recommended it cleaned the block-paving really well, including getting rid of most of the black-spot, which the instructions say you need to use undiluted to tackle, so it over-performed it's promise there. We pre-soaked the lawn where it bordered the block paving as instructed, and six days later there's no sign of any damage to the grass. In my opinion at only half the coverage it promised the value for money of this product is fairly dubious, but it did clean the drive nicely.

Great product to remove years of grime off your patio ,but very potent bleach , so wear protective clothing.

Absolutely unbelievable. This works so well and so so quickly. Used on my patio which had lots of black spots and dirt. It came out like new. A little brush after application and it’s brilliant. Very fast delivery working 2 days.