Love the detailed answer above!
Alcohol is good at drying up water in PCB boards, but when it comes to the LCD, alcohol is worse then water, it leaves a dry mark on the LCD, it might go away in a week or it might stay there.
If it doesn't come off within the week, you should try [http://www.blackberrypartscenter.com/Blackberry-Torch-9800-Original-Black-Touch-Screen-Glass-Digitizer_p_125.html|replacing the Blackberry digitizer], or the screen.