Seeing through the rear window on your British roadster begins to get problematic as the plastic gradually goes from transparent, to translucent, to opaque. There are some exotic remedies offered for sale but I have found that good old auto wax keeps them sparkling and clear. I just do my rear window inside and out whenever I wax the car and it protects the plastic from the elements. The mild abrasive even seems to remove the film that may build up if you've waited too long between wax jobs. Just be sure that you start with a clean window so as not to grind dirt or grit into to your window.

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