Remove Crayon From Concrete
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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.
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Use a butter knife to scrap off as much of the crayon on concrete as you can. It should chip away relatively easily.
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Spray on WD-40 and allow it to penetrate the stain.
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Wipe the stain with a clean towel. The crayon mark will have vanished.