E.M.
If it's Crayola... call the 800 number on the box.
My sister's children got loose with crayons one day while she was on the phone. They ran green and red crayons down the middle of her carpet, down each step on their stairs... Arghhhhh! She had the presence of mind to call the number and found out how to handle it (I think it was dishwashing liquid... like Palmolive... but you'd better check). You'd never know it happened (10 years ago). Apparently, if you mix the wrong chemicals, you can set a stain forever (thus the pen leak spot in my living room). She said when she called, it was a huge automated list of things... if you have crayon on clothing, press 1, if you have crayon on carpet, press 2, if you have crayon on walls, press 3, etc. If it isn't Crayola, look the brand up on the web and see if they have any suggestions, otherwise try the other suggestions people have provided here at Mamasource. This is why I ONLY allow Crayola in my house!
Best of luck to you.
Liz