Vinyl is to soft to get scratches out. Replacement is the only way I know to rid yourself of scratches and fogging/sun fade. That's why great care must be taken when the window is new. They do make a glass rear window. but it's two pieces joined by vinyl. So you have an annoying strip in the middle of the window.
plus that "vinyl" strp is the weak point ,often loosens there...plus with the real glass , top takes more space down ,= harder to install the boot
