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Unread 02-03-2020, 08:44 AM   #5
John Bridge
Join Date: Mar 2001
Location: Rosanky, Texas
Posts: 67,914
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Hi Alex,

The tiles don't appear to be unglazed porcelain to me. Looks like they are pitted and the grout is in the pits. If that is the case you may never get it out of there.

Aside: Unglazed porcelain is almost always smoother than that and typically is just grouted without problems. The exception would be in the case of "polished" porcelain which is sealed prior to grouting.
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