I'm not sure about crayon but I've removed wax from clothing with an iron. Just lay an old rag over the waxy area and press with a dry iron...the wax should melt and absorb into the rag. Crayon can sometimes be a little tougher to get out than plain candle wax, but it might be worth a try. The pigment from the crayon can stain too...I hope that you're able to get it out!