[Buff]

This is going to sound weird but it worked for me. Run it under some water. I spilled hot chocolate on my keyboard at work, we saw that it had "drain holes" so I ran it under warm water. Let it dry for a couple of days and the keyboard worked.

I see that llama has reported a similar solution. Back in school I had to take a hardware class, in this class the teacher jokingly said to put the keyboards in dishwashers to clean them. Two guys tried it to experiment. One keyboard was ruined, the other worked but only for about a month. I've heard other successful keyboard in dishwasher stories though.