If the drapery, air vents, and masking are dirty, then imagine the condition of the screen. Add to that the static electric field created by the speakers. This field attracts dirt too. Like iron filings showing the magnetic field of a bar magnet, an outline of the speaker cone may appear on the screen due to this field. Unfortunately, this layering of dirt is not the only problem.
Moisture plays a role as well.
The screen becomes damp, and in the morning the air condition or heat is turned back on, and the screen dries. When it dries the dirt adheres to the screen. Over time this build up of dirt can t be removed with a screen brush. It can t be dusted the way you dust furniture. It must be professionally cleaned off using our proven five-step cleaning process.