Use a really soft dry cloth, like a paintball safety glasses cloth or something similar. Just use that. Or you can also use pledge dry clean on a smooth cloth.
If it is just dust collected on screen treat it like a pair on expesive glasses with those special transparent film on it; try a scrub-less lint free cloth seen in electronics like a PlayStation...
Clean surface with a solution of mild dishwashing liquid diluted with warm water. Sponge the surface, rinse with clear water and blot dry. Do not use cleaning solvents or abrasives.