Ok, this is something that has been bothering for a long tiime. I have the factory slidning rear window tinted fromthe factory, and then i have my side windows tinted aftermarket. Here is the problem, the dang rear window has water spots on it that no matter what i do or try (product wise) will not go away. Even tried clay barring it to no avail. anyone have any ideas on what to do or use. and yes, i have tried to do both sides of the window before anyone ask will all the asme products and all with the same results. THIS IS DRIVING ME NUTS!!!!!!! figure someone has to have some knowledge of a "professional" product or something out there that will work.