On Thu, 19 May 2011 07:35:50 +0100, The Brownie wrote:

Has anyone come across, or even tried a patio cleaner called Hero?
It
comes in a sprayer and cost me, I think, £3.99. It says just
spray it
on and leave to dry. Hey presto, cleaned slabs.
No way.

One to avoid then.

Possibly the dead algae are still going to be there until something
(rain, hose) washes them away... I suspect it's slightly misleading
advertising in that it shows a sequence of pictures but nothing to
indicate the (variable) time scale or other things (like rain)
happening between them.

--
Cheers
Dave.