I was thinking they're talking about the enclosure, and not the screen, but I could be mistaken as it is vague. For the actual display screen, they say this:
First, disconnect the display from power, from its connection to a computer, and from any external devices. Then use the cloth that came with your display or another soft, dry cloth to wipe dust from the screen.
If additional cleaning of the display panel or case is required, use a soft, slightly damp, lint-free cloth. Avoid getting moisture in openings. Don't use window cleaners, household cleaners, aerosol sprays, solvents, ammonia, abrasives, or cleaners containing hydrogen peroxide to clean the display.
Don't clean the screen of your display with a cleaner containing acetone. Use a cleaner intended for use with a screen or display. Never spray cleaner directly on the screen. It might drip inside the display and cause damage.
Even if they mean cleaning the actual screen with alcohol, then what they are recommending is very light cleaning with only a slightly damp cloth.