How and when should I clean the lens?

• Clean the lens whenever you notice dirt or dust on the surface.
  
  Note: Carefully open the lens shutter to clean the lens. Do not clean the lens while the projector is turned on or still hot.
  • Use a blower brush that is designed for camera equipment to remove dust from the lens.
  • To remove dirt or smears, use a lens cloth or tissue. If necessary, moisten the cloth with lens cleaner and gently wipe the lens surface.
  Caution:
  Never rub the lens with abrasive materials. Use only lens cleaning fluids that are designed for cleaning optics. Avoid touching the lens with your bare hands to prevent fingerprints on or damage to the lens surface.
  
  Warning:
  Do not use a lens cleaner that contains flammable gas or liquid. The high heat generated by the projector lamp may cause a fire.
  
  Before you clean any part of the projector, turn it off, let it cool down, and unplug the power cord. Never open any cover on the projector, except the lamp and filter covers. Dangerous electrical voltages in the projector can injure you severely. Do not try to service this product yourself, except as specifically explained in the User's Guide.