Epson 710/700/500 - Manual (Page 74)

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Cleaning the Lens
Clean the lens whenever you notice dirt or dust on the
surface. Lightly wipe the lens surface with a soft, dry, lint-free
cloth.
To remove dirt or smears on the lens, moisten a soft cloth
with an alcohol-based cleaner and gently wipe the lens
surface.
Cleaning the Projector Case
To clean the projector case, first unplug the power cable. To
remove dirt or dust, wipe the case with a soft, dry, lint-free
cloth. To remove stubborn dirt or stains, moisten a soft cloth
with water and a neutral detergent. Then wipe the case.
Do not use alcohol, benzene, thinners or other chemical
detergents. These can cause the case to warp.