Good morning I’m trying to figure out what’s causing and to stop this spreading of staining, tested with moisture meter, no moisture but where the staining is getting worse there is windows with no Uv treatment. Tried 40% peroxide poultice no change, all of the counters and walls have the slight brownish vains but the window area is the only problem. Not sure if it’s a mineral or resin problem About 4’ wide any idea’s would be appreciated thanks Phil

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