On Thu, 25 Mar 2010 14:20:48 +0000, p.mc wrote:

Hi all

I was about to jet my patio but the pressure washer broke. Is there
another way of ridding this stuff without jetting

hmm, last year's favourite tool, the angle grinder? :-)

I sympathise - doing the patio with a pressure washer was always a right
pain in the bum. Thankfully we just don't seem to get algae here - maybe
it's a humidity thing.