Hey there OP,
We have a couple of wikis that you are going to want to take a look at. To sum it all up, you're going to have to open the laptop up and clean it with 90% or higher concentration rubbing alcohol.
* [[Laptop is Liquid Damaged|Laptop is Liquid Damaged]]
* [[Electronics Water Damage|Electronics Water Damage]]
* [[MacBook water damage - The definitive guide|MacBook Water Damage]]
Best of luck to you!