I've been very good about not touching my (white) MacBook's screen and stopping anyone who tries to get too close. Still, dust and little specs of stuff are accumulating all over the screen. What do I use to clean/wipe the screen? My girlfriend's mother almost cleaned it with a tee-shirt! AHHH!!! *shakes head* Suggestions? I know I should not use regular cloth and I know I should not use Windex.