My kitchen counters and floor are tile. I cleaned the grout by hand today and it looks fine, at least for now.

I have read that cleaning a tile floor with water is wrong because it stains the grout (I think that was the reason given). Anyways, what should I do to keep the floor clean?

We are renting and I was very happy that there was tile. After living with it, though, I would never put tile in the kitchen in my own home. Although the house is only 2 years old, perhaps the grout wasn't sealed properly but I'm finding it really hard to keep clean.