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sorry that you've had a bit of a wait
1st thing to try is to get a can of the silicone spray for lubrication rubber like this
this lubricates rubber without making it soft like oil, so a good spray sown each of the window channels can make a big difference
also look at the workings of the window mechanism by removing the door trim card and inspect the 1/4 gear at the bottom of the mech to check that its greased along its length and the teeth aren't damaged
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