Damp paper towel or damp lint-free cloth.
On occasion, very, very, very diluted Windex - and never, ever, EVER, applied to a matte-finish screen.
Matte-finish screens get cleaned with a damp, lint-free cloth, usually spot-wet and applied to specific areas on the screen, always using a light circular motion. No need to wipe dry. No Windex or chemicals of any kind are applied to matte-finish screens.
Rule of thumb:
When in doubt, always use a damp lint-free cloth.