Need Help with Power Windows Noise
 

Hi, My rear two window make annoying sound when going up and down http://www.youtube.com/watch?v=jIENC6bOSyY I tried to lube the track with silicon spray from top but not much of difference. I see dirt like thing that was stuck on the glass, so might be track needs a clean up. I went to dealer to get few parts yesterday and he said will take them at minimum $120 per side if anything else isn't broken. Can some one please suggest what I should be doing. Thanks, Jay