Liquid has been spilled on my macbook during a party. The morning after, keys were working well but sticky, and the day after, whole keyboard stopped working. The mac could start but password typing were impossible.
I have dismantled all of it, following iFixit guide (top case) and using the screw driver kit (1 week shipping to France by the way, thanks !) and try to clean the keyboard with alcohol (below and above). But it didn't work again.
Finally, I changed the keyboard + alu case at Apple store for 175 Euro :(
I found that keyboard is not "cleanable" and not "swappable", so go to Apple is the only solution...