why is it so much more difficult to wash oil off plastic containers than glass or metal ones
In: Chemistry
Plastic is porous in a way that oils like to slip in to it. Which is why greasy and oily foods can colour the container, especially when the surface is worn and scratched.
Meanwhile metal* and glass isn’t. (Steel and aluminium are, but not so much that oil or greasy can soak in to the structure in a practical sense, but give it a long time and you’ll never get that smell out of it).
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