How do I get melted crayon off of coins?

I have a jar of coins in my car which I use for tolls, fast-food restaurants, and beggars coming up to the car requesting donations. Usually there’s a around $10 in mixed denominations of coin.

Sometime last summer, in the heat, a grandchild put half a blue crayon into the jar. As crayons do in heat, it melted. And now I have a couple dozen physical coins with a crusty coating of melted crayon. The total dollar amount involved is under $2.00, but I don’t want to throw the coins away.

Is there an effective way of getting the crayon off the coins? Would putting them in a saucepan and boiling them work? Ideas?