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
When you’re scrubbing by hand you’re most likely not spending nearly as much time as the machine does, and are also trying to dissolve the stain into a much smaller volume of water. Not many people have the patience to spend an hour or more trying to scrub a stain out by hand.
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