Published on May 5, 2017
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Acetone (in my case used as nail polish remover) can dissolve polystyrene. Dip a piece of Styrofoam in acetone and styrofoam disappear after a while. In my case this way, dissolved in a container made of polystyrene.
NOTE: do not do it alone, unaccompanied by an adult. Chemicals are very dangerous.