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yeah, just roll down the window, put some rubbing alcohol on the tip of the swab, and run it along all the surfaces of the track. It should come out looking pretty dirty...... do this until they're reasonably clean, then take a can of silicon lubricant (works better than WD-40) and spray that in the tracks (or wipe some on all the surfaces where the window and track rub). The window should work fine after that. Do this every time they start to slow down, or at least once or twice a year.
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