If you feel like your hands are sweaty or greasy from work, touching outside objects, or food, wash them before touching your computer. Wash your hands before and after a meal, and before/after using your computer. If you're eating with your left hand, limit touching the computer to your right hand, or vice versa.

So many people leave grease on their hands from eating, or don't wash their hands, and touch the computer. Secondly, and this will get thumbed down but it needs to be mentioned please don't be nasty. Very tiny bit of Windex, and apply to the wipe - NOT THE SCREEN! Buy a pack of clean room wipes on eBay for ten or fifteen bucks, they will last a very long time.