The glass cleaner for lubricant is only for installation purposes. First the aluminum frame is fitted into the rubber gasket, then the rubber gasket is shoehorned over the window flange of the truck. All the while it's kind of got to be able to adjust as it goes in. Then the glass cleaner evaporates and goes away with a clean rag/paper towel. I wouldn't use grease, get it all over your window, headliner, not to mention the dog!