Did anybody ever see something like this happen on a new Porcelain floor. They said it is a spill from coffee.

Then the tile supplier recommended cleaning with Aqua Mix tile & grout cleaner (alkaline) and the same thing happened.

No residue on surface, can't feel a difference on tiles, if you wet it, it darkens for a split second

 

 

Thank you
Carl Staples
Classic Marble & Stone Restoration
www.Marblerestore.com
610-356-4100

 
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