How and when should I clean the lens?

• Clean the projector's lens cover glass periodically, or whenever you notice dust or smudges on the surface. To remove dust or smudges, gently wipe the lens cover glass with lens-cleaning paper. To remove stubborn smudges, moisten a soft, lint-free cloth with lens cleaner and gently wipe the lens cover glass.
  
  Warning: Do not use a lens cleaner that contains flammable gas. The high heat generated by the projector lamp may cause a fire.