when hand washing dishes, how hot should the rinse water be, and why?
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Unless you are in a food service environment where you are required to sanitize dishes, in which case a machine or a dip with sanitizer solution is doing that, you can wash them cold. No human can tolerate water hot enough to kill germs.
It takes water temps of 149 degrees to kill germs. Most human skin will get 3rd degree burns with 2 seconds of exposure of of 150 degree water.
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