We just put in tile floors in our three new bathrooms, and two of them have pale colored grout. Our kids bath has a white grout, and our master has a very pale gray. I wanted to put in a gray grout in the kids bath (B/W octagon dot tile) because I feared white grout staining. However, DH wanted white and our contractor sided with him assuring me that today's grouts were much more stain resisitant, and that he uses a great grout sealant. We've had platinum grout in our marble backsplash sealed with 511 impregnator that has remained spotless (even with dried on tomato sauce)for 4 years, so I bought this spiel.

Well today I discovered that our cat puked on the kids bathroom floor, and it has TOTALLY stained the grout. The bathroom isn't even finished yet! I know vomit is particuarly difficult, but I did expect a little resistance.

The grout is mapei, and the contractor used "Granito Impregnator" from EcoStone to seal the grout. I'm not convinced that sealer did a &@## thing. Obviously I'm going to have to figure out a way to whiten this grout, and reseal it with a different product. What should I use? Can I use my 511 Impregnator on this, or it that a no-go on ceramic?

I am just sick over this...our cat is a lifelong puker, and not to mention what my daughters (currently 2 & newborn) are going to put it through over the years. DH is going to blow a fuse when he gets home and sees it...