The touchscreen of either iPad /iPad 2 / iPad 3 or the latest new iPad 4 / iPad mini is the most delicate part of the device. To keep the screen in the optimal condition it is vital to clean it on a regular base. When cleaning the iPad's glass screen you must avoid any cleansers involving alcohol as the touchscreen is very sensitive and is actually coated with the oleo-phobic material that can be rubbed off with the use of alcohols or other glass cleansers like Windex.
Instead use alcohol-free cleansers suitable for OHP coated touchscreens. We would highly recommend you to use
that perfectly does its job and will never damage the screen of Apple tablet. There, that does the trick.
Take extra care of your iPad to enjoy its power!