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Unread 01-27-2020, 10:30 PM   #3
Kman
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Join Date: Nov 2006
Location: NW Arkansas, Ozark Mountains
Posts: 11,376
My first go-to on porcelain would be vinegar and water 50/50, and if that didn't work, sulfamic acid crystals, after the grout is about ten days old.

Then I might try a magic eraser.

But whatever I try, I would test on a small, inconspicuous spot first.
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