Generally speaking, soaps remove dirt and fats by making them soluble in water.įor a material to dissolve it must share certain chemical properties with the solvent, especially with regard to its polarity (separation of electric charge): polar compounds tend to dissolve in polar solvents (for example common table salt, which is a highly polar compound composed of ions, or charged atoms, is highly soluble in water, which is also very polar). In order to understand why this happens one must understand how soaps (or detergents/surface active agents) work. In fact, even several such washes may not suffice to rid the plastic of that 'oily' feeling, as if it's still covered by a thin layer of fat. First of all – this is a correct observation, as this problem does indeed exist: washing plastic dishes from fat, in contrast to glass plates, is more tedious and often requires several wash cycles.
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