when hand washing dishes, how hot should the rinse water be, and why?
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It’s actually not that necessary to be hot. Hot water when combined with soap does help breakdown and wash away grease, germs, and dirt down the drain. But it is not hot enough to actually kill the germs, the water would have to be boiling hot for several minutes. So it should really be as warm as comfortable for your hands, and no hotter.
Dishwashing machines can be better for this reason… they can use superhot steam to disinfect the dishes (though the downsides is this can ruin certain dishes if they are not dishwasher safe).
Alternatively, they also have dish sanitizer for hand washing… this is a chemical you mix in a sink or tub of water and dip the dishes in as the final step, typically used in restaurants and such that have a 3-basin dishwashing sink.
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