What you do is spray a small amount of it onto the crayon stain, and then rub the stain away.
If you are using it on any type of fibers, such as clothing, upholstery or carpet, you will need to spray on the WD-40 and then also work some liquid dishwashing detergent into the crayon stain, to remove both the crayon and the WD-40.
You may also need to do this on hard surfaces, such as walls.
After the crayon stain is removed you should get plain cold water and a new white cloth and sponge the area to remove the cleaning solution, and then blot dry, being careful with both upholstery and carpet to only get the area as wet as needed to remove the stain.
With hard surfaces, after you have removed the crayon stain with the WD-40 the area will be slick, so you will need to clean up and wipe away the WD-40, especially on floors so you don't slip.
Obviously, as with all stain removal products you should check to make sure WD-40 will not harm your surface by testing in an inconspicuous area prior to spraying it on the crayon stain.
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