Thanks for the reply.
The tile has been cleaned about a dozen times. So, we believe all the grout-dust is gone.
When we take a wet paper towel and run it down the grout lines, the grout comes up.
This grout is on the bottom of our house shoes (not worn outside). We track it on the rugs. So, the grout dust from the grout lines is coming up and soiling the rugs. We cannot clean the floor without getting grout on the cleaning towels/sponges.
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