Depends on the plastic - acetone (nail varnish remover) can easily soften some plastics. IPA (isopropyl alcohol, rubbing alcohol) is a good solvent but much less likely to attack the plastic, I'd suggest that instead.
So in the home could I use vinegar or cheap vodka?
Disc brake cleaner maybe.
@hugo7 started
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Depends on the plastic - acetone (nail varnish remover) can easily soften some plastics. IPA (isopropyl alcohol, rubbing alcohol) is a good solvent but much less likely to attack the plastic, I'd suggest that instead.