How to remove unwanted aftertaste from food So I've just finished making about a liter of hot chocolate (lets ignore why for a minute here), and I've stored it in my refrigerator, inside a plastic bottle that was once used to store orange juice. Although I cleaned and rinsed the bottle as well as I could before using it, the hot chocolate has taken on an orange-y aftertaste. It's by no means inedible, but unwelcome nonetheless.

Is there any way to remove/mask the flavor? I'd hate to have to throw all this out.
There is probably no universal means.  Don't store strongly flavored liquids in plastic bottles you would like to reuse.

In the specific case of hot chocolate, it is ammenable to a number of strong flavors which may mask the odd orangey aftertaste.  I would recommend re-heating it with a pinch of cayenne pepper (really; hot pepper and chocolate go nicely), and perhaps a couple of cardamom pods if you enjoy their unique flavor.