Hi all,

Does anyone have any experience of this stuff?
http://patioblackspotremoval.com/sto...&product_id=54

By way of background it is intended to remove highly persistent black fungal growth from Indian sandstone paving. I've got some in my back garden, and the black spots have started to appear. They do disfigure the look of the stone, and they multiply each year. I've tried high-powered pressure washing and ordinary moss-and-mould-killing type of stuff - nothing will shift the black spots, and this is the general experience reported by others from a bit of internet research. Indian sandstone is particularly prone to it for some reason.

The stuff in the link claims to do the trick. The reviews on the website all give it five out of five - well there's a surprise! It costs roughly the same as malt whisky, which is fairly horrendous for a cleaning product. If it works it will be worthwhile, because the alternative will be relaying the patio with something less prone to black spots.