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a pencil eraser will do it.
Prepsol as mentioned above, IPA, dishwashing liquid, metho, white spirits - but a pencil eraser means you won't remove wax from areas where you want it to remain. Also, those chux magic erasers are handy to have around for particularly stained trim - though use with caution as they are slightly abrasive.
Those Chux magic erasers are awesome. Just make sure you keep them really wet. Big no no to dish washing liquid though. Plastics tend not to like detergents very much.