Most people cover their nose and mouth when they sneeze, or at least turn away, towards the ground. I would be horrified if I sneezed on my iMac. Not because there would be snot and spit all over it, but because I made such a stupid, disgusting mistake.
Anyway, I probably shouldn't judge you.
When I had a laptop (whose screens are dust and dirt magnets), I just used a damp cloth, then wiped it down with a dry cloth. Worked fine. But dry it immediately after the wet application, or you could end up with permanent waterspots.