Now Ammonia and Bleach, that's a bad thing to mix. Oxiclean and Bleach? Well, if you breathed eithe of them deeply enough you'd get just as sick as from mixing it.
I didn’t read every comment so this topic might have been discussed. In reading it appears that the key is to clean it often to prevent the more stubborn stains, but my questions is after using Comet or OxiClean or bleach should we reseal the grout each time?? Doesn’t the scrubbing remove any sealant as well as the discoloration?