how do washing machines work? How does just swishing some clothes around and soapy water get out stains and dirt but scrubbing clothes with a brush and soapy water only seems to spread the stain around?
In: Engineering
First of all, detergent works better than soap. It’s specifically designed to clean clothing. Second, it’s the cycling of water and the total time that makes it work. As it churns around, water, mixed with detergent is dropped on your clothing, which is then churned around the cause friction between the cloth and the detergent mix, and then the liquid drains downward. So for an hour or so you have a steady stream of detergent and water flowing downwards over your clothes, soaking the cloth, absorbing dirt, and then draining downwards.
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