Things to do if your laptop was exposed to water (or other liquid):
1. Remove the A/C adapter and the battery immediately.
2. Turn the laptop upside down to stop the liquid flowing deeper.
3. Use paper towels to clean up the parts you can get to.
4. If you spilled anything besides water (wine, coffee,etc), you should take apart your laptop and clean it (or ask the service guy).
5. Leave your laptop to dry for 48 hours.
