No, your bathroom doesn't drink as much red wine or coffee as you do, but the caulk around your tub and sink can become stained and moldy through normal use. Re-caulking is easier than frosting a cake and cheap enough that you can pick up a box of teeth whitening strips for yourself.
Extra credit: Apply grout stain to the stuff between your tiles to restore or change the color without the tedious labor of digging out the old grout.
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