Taking your Mac to the Genius Bar

[shanti]

I have a 2009 MacBook. A couple of months ago, I reached across it with a rum and diet coke, spilling a little bit on the trackpad. I immediately shut it down, turned it over and let any liquid drain out. My mac hasn't been the same after that. Now when I open it up to use it, the cursor acts very erratic, jumping all over the place, clicking on things I don't want, to the point where I just have to close it back up again. Sometimes it will be ok, but only for 10 minutes or so at a time. I bought an external mouse for it, but it still happens with the mouse, albeit less so.

I'm thinking I have to make a visit to the Genius Bar for a fix, damn the cost. Right now, I make so with my iPad mini, which is less than desireable.

My question is: what should I do about my passwords, etc. before bringing it in for repair?

TIA