For Best Results: Crayola Sidewalk Chalk is designed for use on concrete or asphalt sidewalks and driveways. To remove, wash surface with water pressure from garden hose, Light brushing with a broom or nylon brush may be necessary. Stain Advisement: Product contains colorants which may stain clothing and other surfaces. Before use, test on a small inconspicuous area and wash off to make sure product does not stain. DO NOT USE ON SURFACES LESS THAN 6 MONTHS OLD.