To clean the face pad of the Pico 4 , use a soft, slightly damp, lint-free cloth. Gently wipe the fabric surface to remove dirt. Never spray cleaning liquids directly onto the Pico 4. To clean the remaining surfaces, use simple disinfectant wipes. Be careful not to use alcohol wipes on the lenses of the Pico 4. It is better to clean the lenses with a microfiber cloth.