Soda Spill, Not turning Back On, What Must I Do?

First things first. In the future, if you ever spill any liquid on a device, remove all power sources, including the battery. Since it's a little late for that now, here's what you need to do:

Open up the laptop and remove the logic board assembly. Don't worry about removing the heat sink, though. Take a cotton swab and very high concentration alcohol (>90% isopropyl works wonders) and gently swab all of the connections and contacts on the logic board. Soda leaves nasty sticky residue, so you want to make sure you get all of it.