Smith's Smudgebuster Cleaning Cloth is specifically developed to clean all optical surfaces, from glass to plastic lenses to compact discs. Due to its unique construction, the Smudgebuster "lifts" and absorbs smudges, grease, dirt and fingerprints. For best results, rinse off larger particles before wiping to avoid scratching. Smith's Smudgebuster will not lose its properties when washed by hand or machine and should be kept in its vinyl wallet. Other Smudgebuster uses include cleaning camera lenses, binoculars, jewelry and computer screens. DO NOT use on contact lenses.