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In a townhouse subdivision, nearly every building has black spots on the vinyl siding. They are present from the ground to about 8 - 10' up. The townhouses are two story with composite roofs and gutters. I did not have any roof mix with me. I did have a bottle of Purple Power and tried that. The black spots on a small test area came right off. They seem to have suddenly appeared this year. The Property Manager is perplexed. Has anyone seen these before?

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