when hand washing dishes, how hot should the rinse water be, and why?
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What I learned a long time ago in college chemistry was that a soap molecule has a hydrophilic end and a hydrophobic end, meaning one end likes water and one end doesn’t, but it likes oil. This means soap acts like a bridge between oils which are not water soluble and the water. Which is how it removes oil when washing. However, if you rinse in hot water , it somewhat reduces the effectiveness, so you usually want to rinse in cold water so one end of the soap will cling to the oil and wash away.
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