I just wring-out the dish-cloth and wipe over my computer, laptop and TV screens. Don't even bother to wipe them dry; they dry off without any smears if regularly wiped over with a damp cloth.
I wouldn't ever again use any Window Cleaning Liquid; especially on an Lcd screen. Used Car Windscreen Cleaner on a Cathode Ray Tube Monitor and it removed an Anti Glare coating..... There are chemicals in all Glass Cleaning Liquids.