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There are grout whiteners. Here's an example:

http://www.improvementscatalog.com/...le-grout-sealer

There's a chance, though, that the grout you think you can't get white again may be able to just be cleaned. Have you tried Comet cleanser and a brush? (You could try making a Comet cleanser paste, and sticking wet paper towel strips over it. That keeps the Comet wet longer. Comet bleaches things, so it cleans things you wouldn't otherwise think could be cleaned.)

Then, too, there's the Comet Spray bathroom cleaner. This stuff is a miracle as far as I'm concerned. I had a light gray stain on the wall near the bathtub, and no matter how much I scrubbed it, it wouldn't come off. I assumed the wall was damaged, and the light grain was permanent. (Even Coment cleanser didn't clean this one.) Someone suggested the Comet Spray. I sprayed it on, let it sit for about a half hour, and went in and wiped the gray away with a paper towel.