Cleaning instructions from user's guide:
From page 35:
Cleaning iPad
To clean iPad, unplug all cables and turn of iPad (press and hold the Sleep/ Wake
button, then slide the onscreen slider). Use a soft, slightly damp, lint-free cloth. Avoid
getting moisture in openings. Don’t use window cleaners, household cleaners, aerosol
sprays, solvents, alcohol, ammonia, or abrasives to clean iPad. The iPad screen has an
oleophobic coating; simply wipe the screen with a soft, lint-free cloth to remove oil
left by your hands. The ability of this coating to repel oil will diminish over time with
normal usage, and rubbing the screen with an abrasive material will further diminish
its effect and may scratch your screen.