when hand washing dishes, how hot should the rinse water be, and why?
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It doesn’t really matter. It’s the soap that’s mostly killing the germs, not the heat. But hotter water will help the soap and gunk dissolve and rinse off better. So use comfortably hot water but mostly make sure it gets nice and soapy. In commercial food settings the water does have to be very hot for maximum sterilizing and to make sure as much gunk dissolves off as possible. At home, you don’t have to reach such crazy high standards.
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