Eraser Daddy can be used on hard surfaces like walls, baseboards, switch plates, door frames and railings. The eraser side can scratch or dull some surfaces so it is good practive to test a small and inconspicuous area first. Avoid use on soft plastics, non-stick coatings, finished or unfinished wood, automobile finishes, stainless steel, copper, leather and bare skin. After using on a surface that may contain food rinse thoroughly to remove any residue.