Dirt makes the surfaces of objects look shabby, and can cause them to deteriorate as well. Art conservators advise not touching the front or back surfaces of oil paintings, because this can cause cracks and other damage. Do not apply cleaning solutions, solvents, sprays, or insecticides near any work of art. Use a soft natural-bristle brush to clean objects and paintings when the surfaces are in good condition. Even feather dusters are not recommended, because feathers can catch in small cracks and dislodge fragments of paint or surface. Traditional advice for the cleaning of a painting's surface is to very gently rub it with a wad of white bread.Also see art conservation, blot, caustic, clean up, eraser, hazardous, preparator, stain, stain removal, and volatile.