First you need to remove the damaged grout. Do this by using an old (or cheap!) flat head screwdriver to scrape and dig out the loose grout. Vacuum or brush away any dust. Mix grout mix and latex filler (to make it hard and more water proof) and fill in the spaces. Smooth the grout and then sponge off the excess that is on the tile. Allow to dry for a day and then wipe off again.
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