Remnants of dirt, debris, and soap that are not rinsed down the drain can harden on the surface of a bathtub or shower, forming a residue. Limiting the amount of residue is important because mildew often grows in areas where residue is not properly removed. Also, areas that are prone to water infiltration should be regularly inspected and repaired as necessary.

This topic includes information related to bathtubs that are installed in residential structures during construction. A bathtub is a plumbing fixture, that in conjunction with a faucet, is used for cleaning. They are made from a variety of materials, including enameled steel or cast iron, acrylic, fiberglass, wood, stones and metals.