soap scum en · NOUN
Pronunciation
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Meanings
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(uncountable) The buildup of insoluble calcium or magnesium fatty acids from the use of soap with hard water, which leads to a dulling of surfaces and acts as a matrix for trapping soils.
Bars made of real soap (sodium salts of fatty acids) are still very popular products for showering and whole body bathing, however, and using these products will produce soap scum. It is interesting to speculate on whether soap scum becomes less of a problem as use of shower gels continues to increase.
2008, Uri Zoller, Handbook of Detergents, Part E: Applications, →ISBN, page 96:You can purchase one of the numerous cleaners on the market specifically formulated to dissolve soap scum or use a variety of home remedies for ridding tile, showers and bathtubs from the dull gray film.
1999, Jeff Bredenberg, Clean It Fast, Clean It Right, →ISBN, page 349:Clean soap scum off a tub or shower stall by applying hot vinegar with a sponge or rag, then scrubbing hard with a stiff-bristled scrub brush.
2007, Ellen Sandbeck, Organic Housekeeping, →ISBN:
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de Kalkseife (Translations)