Any ideas on not just how to remove such small stains without treating the whole wall, but also how to keep them from coming back? At the top of each rust stain there is a dark pocket, like a piece of iron in the stone or something.
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Not sure if there is a better way, but I would use F9 Barc to remove the rust stains, then mix up some JB weld to cover the metal spots so they don't rust again. JB weld comes out grey, and would be less noticeable than the rust.
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