People use a variety of methods to wash clothes. Usually after adding the soap, they 'beat' the clothes on a stone, or beat it with a paddle, scrub with a brush or the mixture is agitated in a washing machine. Why is agitation necessary to get clean clothes?
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Molecules of soap form micelles with dirt, such as grease. Micelles remain suspended as a colloid. To remove dirt in the form of micelles from clothes, agitation is necessary to get clean clothes.