How and when should I clean the screen?

• If the screen gets soiled, clean it using a clean, white, 100% cotton cloth. Dampen the cloth with clean, clear water (do not use detergents). Gently wipe the soiled area in one direction only. Do not use a circular motion. Wipe any moisture from the screen using a dry cotton cloth. A lint roller or masking tape may be used to remove loose dust or lint.
  
  Warning:
  Before you clean any part of the system, turn it off and unplug the power cord.