I was hired to clean the floor of a shower that had a long, dark stain that the homeowner had battled for years. I think the stain came from chemicals leeching off some of the metallic color on the shower wand's hose.
I tried all kinds of cleaners including oven cleaner to remove it. Nothing worked. I finally solved the problem by wet sanding using a drywall sanding block. Wendy for the win!!!
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