Regrouting / Caulking / Cleaning Page
Mildew is caused when either too much water has been sitting on the walls, tub ledge, or floor for extended periods of time, or the grout is old, worn out, or missing. Dripping faucets, harsh cleaning chemicals promote the breakdown of grout, further creating mildew growth. If your faucets drip, contact a plumber.
I strongly suggest regrouting worn or missing grout. Before regrouting, remove at least 16th of an inch of the old grout by using my Regrouting Bits. New grout will not stick properly to old grout that has been exposed to chemical, hard water, and soap scum build up. If the grout is semi-warn, has void spots, yet solid, clean the grout as described below. New grout will stick better to a clean chemical free surface.
Bathtub seams (where the tile meets the tub) should always be filled in with silicone, not grout. The weight of water being filled in the bathtub pulls the tub downward from the walls causing tub seams to expand and contract. Silicone will give with movement; grout will crack. The omission of silicone around the tub and floor seams in a bathtub/shower is one of the primary causes of water seeping through the ceiling below. Many contractors omit the use of silicone due to lack of skill in applying it neatly, plus the additional cost and time factor. Remember, tubs need to contract and expand