Tumbleweed wrote:

" Emrys Davies" wrote in message
...
Try brushing one of the spots with neat Jeyes Fluid and I think you will
have some success.

I think that will cost me about £1000 in Jeyes fluid to clean it all up
though, it would be cheaper to get new paving laid :-)

Its not just that there are thousands of spots, these are what are left
after severe pressure washing, and there is still a coating of algae there
as well! Maybe its lost cause.

If you can stand the smell just water it all over with dilute Jeyes fluid on a
sunny day and leave it to dry. It kills algae stone dead - may take a week or
two but is pretty effective. Don't get it on other green plants.

Regards,
Martin Brown