Floor tile grout

I've just finished regrouting bathroom wall tile for a friend, and now the grout in the ceramic tile floor looks grungy in contrast to the walls. What can I use to 'freshen up' the floor's appearance? TIA
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From what I have heard you can always add to grout. I would just use one of those little tools to take off a little bit and roughen it up a bit. Then put down some new stuff.
PhotoMan wrote:

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