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Here's a couple roof cleanings from my home town of Denton, MD.  The first is one that I have wanted to clean for a while.  I knew that a no pressure roof cleaning would make a dramatic change to this algae covered roof.  I spoke with the homeowners back in the fall of 2009.  They just recently decided that they were ready to have it cleaned.  The after pic was taken before mother nature had a chance to rinse it totally clean, but the difference was incredible.