cleaning my patio

chick123 | 09:07 Tue 27th May 2008 | Home & Garden

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My patio, which is made from York stone, is covered in small black spots, the largest is about the size of a 5p, and they seem to be getting worse. I have tried power washing but that doesn't seem to shift them.Does anyone know what this could be and how I can get rid of it?

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