I would recommend sealing the tile/grout after you use whatever product you want to recolor. Our grout was very discolored when we purchased. I don't know that the builder ever sealed our tile/grout. It was so badly stained in some areas that it seemed almost impossible that it had been properly sealed. Renewing (or recoloring) the grout and sealing the tile will give a really nice appearance and as folks noted, it's a fairly easy DIY project. I used a toothbrush to ensure I got good coverage of the grout with the new color and then wiped off with a wet sponge as noted.
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