Slight power window problem, Window "sticks" a little - anyone else had this problem? Options

[wilc4]

Hey everyone, I have a 1996 Celica GT-S Convertible. I had some problems w/my driver's side rear quarter window, which I fixed by cleaning the dash switch.

Now my passenger quarter window is giving me a problem. It rolls down fine, but when you roll it up it goes about 80% of the way up and stops. It will then go up the rest of the way if you push the switch and pull up slightly with your hand.

Already tried cleaning the switch like I did on the drivers side. This made it quicker but it still sticks. My thought is that their must be a track inside the window assembly that I can lubricate. Anyone know about this? If there is, how do I get to it and what should I use?

Thanks!