It used to be that to remove carpet stains caused by crayons, one would have to scrape off as much crayon as possible with a butter knife. After than a cloth or paper towel would be placed over the area, and it would be pressed with a warm (not hot) iron. When the towel was lifted, the crayon would be removed. There's a new method for cleaning carpet stains that are wax based, however. WD-40! Just spray on, leave for a minute or two and wipe off! What could be easier than that?