Hi, Eric, I have a strange question for you. Is there any way to remove pet urine from the grout on a tile floor? The installer did not seal the grout when it was installed.It is sand grout and porcelian tiles. I have tried to clean it with clorox,tile cleaner,soap &water, vineger and water. It still has a strange oder. Could I just try to regrout and seal it? Would that help? I would appreciate any suggestions. Thanks, Karen