Hi. If anyone has any advice or has ever encountered a problem with a reddish colour stain/algae on a concrete garden wall which is impossible to remove, have tried bleach etc; its in every concrete garden wall in our area.
Hi. If anyone has any advice or has ever encountered a problem with a reddish colour stain/algae on a concrete garden wall which is impossible to remove, have tried bleach etc; its in every concrete garden wall in our area.
Are you my next door neighbour?
I have this issue too, I have no idea what has caused it.
I am going to power wash it in the coming days, I'll let you know how it goes.
I know the reddish colour will wash off but I am interested to see if it will come back!
it is a common fungus that grows on unpainted concrete walls... it is more apparent in boggy or wet areas such as the midlands etc.... well i suppose all of ireland is 'wet' these days....
Simple powerwashing wont solve the problem... it will need chemical cleaning, like bleach. Then paint the wall.