Soap scum, a gray or white film formed when hard water mixes with soap and other residues like dirt and body oil, often appears on shower doors, bathtubs, tiles, and faucets. Besides being unsightly, ...

Add Yahoo as a preferred source to see more of our stories on Google. The scourge of showers and bathtubs alike, soap scum doesn’t get its name by being a beloved addition to bathroom fixtures. That’s ...