Thursday''s Ask the Experts question from a cleaning professional on the International Custodial Advisors Network (ICAN) "Ask the Experts" page: I have a new floor installed, Pietre Native porcelain tile. What is the procedure after the grouting is complete? The contractor does not know or have any written documentation. Is it grout and seal, or grout and impregnate, or something else. The product says it’s "fully vitrified." I need the cleaning contractor to know before they attempt to clean the floors and leave me with something damaged from the start.
The tile manufacturer is the best source of guidance, beyond that, here''s what I would suggest. Porcelain tile is vitrified, meaning that it has a glass-like surface with a very low permeability, like the china toilet bowl.
There is no need to seal the tile since it is almost impervious to moisture in its natural state, and it is hard to resist wear. The installation contractor should have cleaned all the grout off the tile when it was fresh. And we hope they did because using an acid wash indoors to remove ...
— Lynn E. Krafft, ICAN/ATEX associate editor, firstname.lastname@example.org