We did a complete remodel of our bathroom last year in black and white tile. It was love at first sight, but it didn't last. Within a month, the pristine white grout was gray. Because it's our only bathroom, we thought maybe we hadn't gotten it sealed soon enough or well enough, so we removed the grout and redid it with the kind that has the sealant already in it. This time, it looked like cement from the start. I was very disappointed. We did find a bottle of dye for grout that we tested in a corner and it did whiten it up, but again, it only stayed for a couple of weeks. What was my favorite remodel is now making me crazy. Can anyone suggest what I can do to keep my beautiful white bathroom white?