How to clean a touchscreen: All you need is a simple cleaner and a special cloth

Barbie asked how to clean an oily "serum" off her laptop's touchscreen. Do you always wash your hands before using your laptop, tablet, or smartphone? Neither do I. And the result isn't pretty. A chemist could probably take samples from my iPad's screen right now and tell you what I had for breakfast. Touchscreens need to be cleaned often. They get dirty quicker than non-touch screens, and the dirt interferes with both the visual experience and touch sensitivity. [Have a tech question? Ask PCWor...