Hard-water stains are the result of water that contains a high mineral content leaving marks on faucets and fixtures, tubs and showers, refrigerator water dispensers and other similar surfaces. While exposure to hard water is not unhealthy, and works as a way of absorbing minerals such as magnesium, iron and calcium, dissolved mineral particles in hard water leave stains on surfaces along with soap scum, lime deposits and other film. Additionally, detergents and shampoos do not work efficiently in hard water.
White vinegar is used as a natural cleaner for many household appliances and items ranging from coffee makers to kitchen and bathroom surfaces. White vinegar contains 5 percent acetic acid and, as such, works effectively as a hard-water cleaner for refrigerator water dispensers, as well as glass. It also removes rust stains from sinks and tarnish from copper and brass. Soak a clean rag or toothbrush in white vinegar to wipe down your refrigerator water dispenser.
Lemon juice, like vinegar, is a weak acid that can be used to clean hard-water deposits on refrigerator water dispensers. It contains citric acid and can be used to remove hard-water stains in the same manner as white vinegar. Another option is to rub a halved lemon over deposits. Lemon juice and white vinegar may also be used in conjunction with one another to remove stains: Rub a lemon over the fixture, then drape a vinegar-soaked rag over the fixture for an hour.
Use about a quarter-size amount of baby oil on a clean rag to remove hard-water stains. After the oil has been rubbed into the affected areas of the dispenser, use another clean cloth to remove the oil. Olive oil can be used as a substitute for baby oil.