Almost all of the people who gave you advice earlier are idiots. Water is horrible for LCD screens. It can leave permanent water spots and marks, and NEVER use anything other than 100% cotton to clean it with. Toilet paper, paper towels, anything like that can scratch the monitor. So here is what you do:
Turn your computer off first, so as to avoid any shorts or anything and to allow it time to fully dry.
Take something 100% cotton... An old shirt, sock, etc..
Use a small amt of rubbing alcohol on the shirt and lightly wipe the screen. Alcohol works best because it is fast drying and wont leave spots or anything.
/txtmngr/images/smileys/smiley1.Gif-reply by Casper