Mineral ions (typically calcium and magnesium) in hard water combine with the fatty acids in soaptoform insoluble stearates, which you may know as soap scum-the waxy white residue that sticks to your tub and shower walls. Since it's kind of futile tocleana surface with the same hard water that caused the problem, and since the other chemicals here need pure water to work well, SCJohn- son's Scrubbing Bubbles is made of at least 60 percent pure water.
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