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Unread 02-10-2020, 09:39 AM   #11
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Join Date: Dec 2004
Location: Sarasota FL
Posts: 1,234
You could try mixing some grout and scrub it with a sponge forcing the sanded grout into the tile a bit. Sponge it off so the tile is clean again and rinse it off with some lightly acidic water. Don't let it sit of course, clean it right away. I do it with Bisazza glass mosaics all the time. Your tile is slightly pitted so I wouldn't expect to get all that out but it's worth a try.
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