Hi Lacey,
I agree with Kappy, you need to get the machine into a service provider... ASAP. That top case / keyboard assembly needs to be opened up to determine what damage the soda may have really caused (corrosion).
Manually removing each key to clean the underneath is pretty tedious and will no doubt result in broken "key cap seesaws." It might almost make more sense to replace the top case all together (run you about $125 if you DIY). But that still won't address what (if any) damage has occurred to the "guts" of the machine.