I myself, would not use a sealer. The only time water can get in between tile and grout, if there is a crack or hole. You can patch grout areas as needed if you have same color grout. Usually the bad areas are where the floor and wall meet together.I myself, every year or so, rip out the old caulking between wall and floor, clean it real good (and let dry overnight) and then re-caulk nice and evenly (and let dry again overnight) Good to go!!!! I like using Ka-Boom to clean soap off of tiles, and the bar of soap is always put on a folded wash cloth, so the soap does not drip down wall, or drop to floor. I'm sure you will get other ideas from good people out there
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