|is this a desktop or a laptop? i spilled on a laptop once, and the juice leaked into the circuitry and destroyed the laptop.|
it sounds like the problem is just sticky juice dried under the keys and is causing contacts for keys NEAR the key you press. i've done that before.
if this is a laptop and you're lucky, the issue will be isolated to your keyboard hardware, and no juice leaked onto the circuit boards inside. or maybe you're lucky enough to be talking about an external keyboard for your desktop PC, and the PC tower itself is isolated from the keyboard.
if this is a tower PC with an external keyboard, i'd just suggest buying a new keyboard. $20 most anywhere.
if it's a laptop, is it under warranty? that'd be easiest. if not, you might still be able to purchase a replacement keyboard from the manufacturer or eBay/craigslist.