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+1 on the Armor All comment... I rejuvenated my door panels and some other misc interior parts about 4 years ago with a lot of armor all when I had them removed from the car and I've had issues with a greasy film that builds up on the insides of the windows ever since. Meguires cleaner wax and a towl takes it off pretty well.
New vinyl can also off gas and cause a film to build up
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