Black Spots On Patio

Postby chewit » Mon Sep 15, 2008 12:04 am


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 :(
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Joined: Sun Sep 14, 2008 11:53 pm


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