Lightly dampen the sponge.
Shower tile grout repair.
Step 3 clean the seams.
Measure the space between the tiles.
Grout is available as sanded or unsanded.
Match the caulk at most tile specialty shops you can get or order sanded caulk most floor grouts are sanded that will closely match your existing grout color.
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Use a grout saw to remove the loose or damaged grout in between the tiles.
Be careful to avoid damaging the tiles.
Choose the correct type of grout based on the width of your tile joints and where the repair is being done.
Allow the grout to begin to dry for about 10 minutes or until it resembles stiff putty then wash the surface of the tiles with a grout sponge to remove the excess grout.
This fix is only practical for interior tile floors and when the gaps between the tiles are 1 4 in.
If the space is larger than 1 8 of an inch use a sanded grout.
Then take an old toothbrush and scrub the seams.
Gently run the grout saw back and forth along the grout seams.