Put them in the freezer for a few hours and the wax will just fall right off.
Cover it in pan of very hot water. In just a few minutes wax will be warm enough to wipe off with paper towel. Water must be very hot.
Freezing them works the best! You can just chip the wax off with a plastic spoon or your fingernails. If you use warm/hot water the wax has a tendency to smear around when you try to wipe it off.
I second freezing them. hot water makes a mushy mess.