Try to dissolve sugar in ice cold water or clean an oily pan with ice water, it will be difficult. Try the same with warm/hot water and things go much easier. How well soaps works is related to temperature. Too cold and they don’t work as well. Modern detergents though are typically happy with warm water, doesn’t need to be scalding hot. Modern washing machines often mix hot and cold to reach a desired temp, that may mean mixing some hot with cold even if you choose cold or mixing some cold with hot if you choose hot.
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