What will get hardened cheese off of serving spoons?

I make soups and things with melted cheddar cheese in them. But I have such a hard time when it comes to clean up afterward! I wondered if there was some sort of solution or cleaner that takes melted- then hardened- cheese off of spoons? (I have a wooden spoon, a metal spoon, and a plastic spoon... all are being very stubborn right now.)