MacBook Pro 2009 mid-year trackpad going crazy

I have a 15 inch, MacBook Pro, mid-year 2009, unibody, not the earlier 2009 model. It has 2.8 ghz Intel Core 2 Duo. The bottom is one piece, does not have the latch like earlier model did. I am running the latest OS - 10.8.3.

About 6 months ago, i was cleaning the outside of my laptop with a damp cloth. I did use some general cleaner (Fantastic), as well. I know I shouldn't have done that. The trackpad started acting erratically. I read on the forums here, about properly cleaning the laptop, and that it could be a battery issue, as that was common with this model - possible battery bulging, affecting the performance of the trackpad. The battery health did say poor, and I need to chang the battery. I use AC power much more than battery. However, a few days later, the trackpad started working great, and did so until about two days ago.

Two days ago, I cleaned the outside of my laptop - again. And again, the trackpad started acting erratic, except worse. And has not recovered. I have read all the online forum articles, and other internet resources I can find. I have wiped the trackpad with a damp cloth. I have taken the battery out and checked for warped shape, or bulging in the middle as some articles have suggested could be the problem. Battery looks fine. In fact, i now have the battery completely out, using AC power only. I do have a new battery on order. Battery now now loses its charge very very fast.

Here is what trackpad is doing: sometimes the one finger swipe cursor does not move or work. But does work most of the time. Two-finger scrolling up and down, is almost virtually impossible. It is jerky. The cursor jumps around on the screen, from one place to another. I have applied pressure to the trackpad (slight) to see if that helps. It does not. And evern worse, when I am not touching the trackpad, the cursor has a mind of it's own. It moves and jumps erraticly, around the screen. Sometimes windows pop up and back without touching trackpad. Quiet a few times, "LaunchPad" will open up on my screen - yes, without me touching it. All of this is occuring when battery is in, but ALSO same thing wihe battery is OUT!

I do need a new battery, but with the battery out, and me still having trackpad problems, I am beginning to think I may need to replace the trackpad. too. Any thoughts, suggestions, solutions? I thank you in advance.