What can I use to seal the grout on my ceramic tile shower walls—and is this something I can do myself?

Many brands of grout sealer are available for this purpose; most are easy to apply, but make sure the grout is first cleaned thoroughly. Grout sealers are available at most hardware and home supply centers.

TIP Most of the silicone impregnators sold for sealing marble also work great as a grout sealer. These impregnators can be applied over the ceramic and should not effect the ceramic tile. Be sure to wipe off any excess sealer from the tile.