ULTIMA-PLUS XPBlack Spot Eliminator for Patio, Stone, Block Paving, Indian Sandstone, and More - Easy to Use Fluid for Stubborn Dirt & Grime (15 Litres)

I've used this stuff for a few years now and it's not let me down. I purchased a "box" of 3 this time which makes it much more economical.I use it twice a year on an Indian stone patio. It was a builder/landscaper who recommended this product when he was extending the patio and trying to get the old slabs looking good. Initially, I did have to go over the slabs twice and on some of the real nasty spots 3 or 4 times but they now look great.I use a pump pressure sprayer to lay the stuff down and an old empty spray bottle from the kitchen for areas that need a bit of accuracy so not to kill any plants etc. It's very simple to use and OK it smells a bit but that soon goes away. Once you add the job to your garden chores then you wont look back.

Was not sure which brand to buy as our indian sandstone slabs were in an awful state. Had black spots , green algae & dirty. We have pressure washed them in previous years but didn’t take all marks off. This is brill , I can’t praise it enough the slabs look like new & other people have commented on them. So pleased and will tell others to buy this product. Please do make sure u wear protective covering as very powerful, neighbours thought we had a swimming pool being put in as very strong chlorine smell but def worth it so pleased and amazed at how they look. Also, arrived next day, good service.