Kids color on pretty much anything they can. At some point, you will end up with crayon on just about every imaginable surface. Fortunately removing crayon from concrete is easily done.
Remove Crayon From Concrete
Place the ice cubes on top of the crayon for five minutes to cool the crayon to the point that it is easily chipped off.
Use a butter knife to scrap off as much of the crayon on concrete as you can. It should chip away relatively easily.
Spray on WD-40 and allow it to penetrate the stain.
Wipe the stain with a clean towel. The crayon mark will have vanished.