Friday, March 26, 2010

mildew on crab orchard

Hope someone can help with below question:

I resently had a new stoop installed (January) with crab orchard and noticed at installation there were little gray/black spots on some of the stone. Since instalation I noticed that the staining has spread. It looks like mildew to me. Any advice on how to remove the spots if it is mildew or any next steps.
   

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