Hi I've recently developed a rattle on the offside rear window. It's not electric. When I wind it down about 1/4 inch the rattle goes. Yesterday it was better and it was much milder so I am assuming that the cold weather has caused the window 'housing' to shrink a little and cause this rattle. It became quite bad. I've heard there is a silicon spray that can be used to stop such rattles. Any thoughts/ideas much appreciated. Regards.