Rinse in fresh water after each use. Keep O-ring lubricated and free from sand or dirt to ensure a smooth water tight seal. If there is sand or dirt on the O-ring, gently wash to clean. If needed, remove the O-ring, wash off dirt and sand, and reapply a small amount of lubricant before reattaching the O-ring. Avoid contact with solvents, detergents, alcohol and oils. Avoid sharp objects near the mask, as this can scratch the lens or puncture the silicone parts. Keep the product away from heat sources. To remove build-up of sunblock or similar, wash gently with liquid soap.Do not wash with anything abrasive as this can scratch the surface.