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Black Spots on Patio Block Paving

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Holmbrae | 06:53 Mon 14th Jun 2010 | Home & Garden
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After cleaning I have noticed very small black spots all over my patio it looks like rain drops at first the same sort of size. Any ideas on what this could be
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Avatar Image heathfield
It's a mould, and is exceptionally difficult to remove. Even bleach, fungicides, power washer, etc, seem unable to do the job. There is a product that claims to have the answer, see..

http://www.amogen.com/drive_gallery.htm
09:01 Mon 14th Jun 2010

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