So, it finally happened, my wonderfully spotless 2209WFP got a smudge in the middle of the screen, I tried to rub it off (Not thinking of course!) and only made it worse, so was wondering what people use when they clean their 2209WFP? I'm wanting to buy a proper specialist cleaner and not just wet cloth and towel as I want to make sure i don't damage to screen at all, thanks.