i had that problem too, when i used WD-40 in my window tracks the binding got worse, so what i started doing is using Jig-a-Loo.. i spray it into the tracks, leave it for a minute or two, then run Q-tips or some other cleaning device on a stick through the tracks to get all the gunk out, once the gunk is out i spray it down again with the jig-a-loo.. knock on wood my windows still work very well and i havent done any mods other than spraying them down