First off whiteout...I hope you feel better!
I am glad this topic came up. I have been wondering what was safe to use to clean the touch screen myself. I never had a touch screen before so I didn't know what could damage the surface coating. I want to get a screen protector and it is usually best to clean surfaces (usually with alcohol) before applying anything. Wiping it with a soft cloth is great to make it not be smudged. But there is still body oils left behind.