I Use Crc Heavy Duty Silicone Spray From Wal-mart In The Lubricant Isle In Automotive Right By The Wd-40 Its In A Red And White Can $1.77.just Spray It On The Side Tracks Where The Edges Of The Window Run,use The Little Stick That Comes With It,some Will Get On The Window But Wipes Right Off With No Goobery Oily Stuff.spray It With A Good Amount The First Couple Times To Git Things Lubed Up And Then Run Ur Windows Up And Down And It Will B Like Magic,then When U Start To Notice Them Slowing Again Spray Them Again,u Will Probably Have To Do It Once A Month Or So Depending On Temp Conditions Outside,and Winter They Will Run A Little Slower Cause Cold Air Makes Things Expand There For Causing Friction So U Will Have To Keep Lubed More Often Maybe In The Winter If U Have Winter Where U Live Lol.