How do you get crayon out of already washed and dried clothes?

I've heard to try this: First, rub ice on the wax. The ice will harden the wax so you can scrape off as much as possible. Then try placing a paper towel or two on top of the affected area and iron over it with a low heat. The iron is supposed to melt the wax and the paper towel should wick the melted wax away.