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That's 'soap scum' that you may also find clinging to your shower stalls and leaving your skin, hair, and laundry looking dull. One way to test for hard water at home is with dishwashing liquid ...
Soap scum forms when calcium cations from hard water combine with soap, which would dissolve in soft water. This precipitates out in a thin film on the interior surfaces of baths, sinks, and drainage pipes.
Soap scum or lime soap is the white solid composed of calcium stearate, magnesium stearate, and similar alkaline earth metal derivatives of fatty acids. These materials result from the addition of soap and other anionic surfactants to hard water .
With hard water, soap solutions form a white precipitate instead of producing lather, because the 2+ ions destroy the surfactant properties of the soap by forming a solid precipitate (the soap scum). A major component of such scum is calcium stearate, which arises from sodium stearate, the main component of soap:
“Lemons are acidic and therefore contain antiseptic and antibacterial properties, plus they cut grease, dissolve soap scum and hard water deposits and can be mixed with baking soda and vinegar ...
Related: How to Clean a Dishwasher to Remove Buildup and Soap Scum. 1. Clean the Dishwasher Regularly. Cleaning the dishwasher is a necessary task. But are you doing it correctly—and, if so ...