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Due, Get a good dust mask & a cover for the dash & windshield, ect. & go to town with a wire cup brush or similar item on a grinder. There are several chemicals that will dissolve rust, muriatic acid for one, can be used for the pitted areas. Then use one of the rust stopping/prohibiting paints (put a couple coats on) & reinstall in sound deadener/mat/carpet, ect. Lorne