I've been using a micro-fiber towel to wipe of my screen when dust gets on it, but now (after 2 years) the monitor of my laptop has filth on it that goes beyond dust. When it's off and you see a reflection in it, tons of these smear/sploches become visible, even when it's on you can see the un-clearness of the monitor. I'm talking anything from fly poop to spit from people talking here. Anway, the question, what can I use to clean the monitor? Water alone doesn't do it.