Kids using crayons to draw on walls is the stuff cartoons are created around. When it happens to you, however, it's not so funny. While the kid behavior may not be so cute, removing crayon marks from walls is actually pretty easy. All you have to do is wave a hair dryer back and forth on the crayon marks to heat up the wax. The heat from the hair dryer melts the wax, and then all you have to do is wipe it away with a wet towel or sponge. If any residual remains, just dampen a cloth with equal parts of bleach and water and then wipe again. It should do the trick!