MBP cannot start without reset SMC and automatically shuts down

I had some water problems.

I could not start my MBP, but I managed to start it with resetting the SMC, doing the following:
1. Remove the power line for 5 secs
2. Attach the power line again
3. Press shift-ctrl-alt-power.
4. After 5 secs the MBP powers up

My problems are the following:
1. If I shutdown my MBP, I have to redo the steps above. Meaning that I cannot use it without power supply. Because:
- if I don't do step 1, the MBP starts up with full fan and shows no battery in osx. So my guess is that it cannot communicate with the SMC.
- if I don't do step 2, the MBP starts up for 1 second and then shuts down.
- if I do both steps, the MBP starts with normal fan and I can see the battery normally.
2. My MBP suddenly shuts down while working. Sometimes I can work for a whole night and sometimes it suddenly shuts down. Sometimes it politely asks whether I want to shut down, but I cannot click cancel fast enough.
3. I cannot put my MBP to sleep, it will not restart
4. Probably unrelated, but I just mention it: my volume down key hangs. So apparently there's still some liquid in the keyboard.

My assumption:
- Somehow the SMC does not receive power while the computer is not running.
- I guess detaching the power line shuts down the SMC and then re-attatch it with SMC reset, will power it up again.
- I guess when my MBP goes to sleep, also the SMC does not get power and shuts down the computer.

I read several posts (http://forums.macrumors.com/showthread.php?t=1713315) and (http://forums.macrumors.com/showthread.php?t=1713315) that it might be caused by corrosion around the SMC.

Questions:
- Are my assumptions right?
- Might any liquid in the keyboard cause a short-circuit that affects the SMC power? I assume the keyboard always receives some power to detect whether a key is pressed, even when the computer is turned off?
- Might any liquid in the keyboard cause something like a "request shutdown" key-press?
- Where can I find the SMC? I have a MBP8.1

Thanks in advance!