Black Spots On Patio
Posted: Mon Sep 15, 2008 1:04 am
Hi
Today i power washed my natural stone(untreated) patio. It was covered in green algae. Once cleaned I was left with black spotted slabs. The pressure washer could not remove and in fact they did not scratch off!
Please, someone save me from my polka dot patio :(
Today i power washed my natural stone(untreated) patio. It was covered in green algae. Once cleaned I was left with black spotted slabs. The pressure washer could not remove and in fact they did not scratch off!
Please, someone save me from my polka dot patio :(