To get crayon marks off upholstery, first scrape excess crayon off with a dull-edge knife or metal spoon. Spray with WD-40 and let stand a few minutes. With a small, stiff bristle brush work crayon stain and wipe with paper towels. Respray with WD-40 and apply liquid dishwashing detergent on the sprayed area; work in with the brush and wipe stain away with a damp sponge. If stain remains, repeat the procedure.