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Unread 01-31-2020, 08:11 AM   #3
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Join Date: May 2017
Location: Milwaukee WI area
Posts: 1,061
you could try soaking the stained tile with some kind of oxygenated bleach, like oxalic acid.

do you have a spare sheet? put some sealer on it and try to re-create the stain. then try oxalic acid on that. you would mix the acid with warm water then let the marble soak it up. I have no idea if it would even react with whatever chemical the yellow stain is.
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