Think I finally figured out a cure for the black rubber window molding discoloration. I have a black Exp. and bought some Turtle Wax in black. Turtle Wax offers wax in colors. As far as waxes go, the wax isn't very good, but I did try it on the window molding and it works. I first used it a month or so ago and it held up pretty good. I reapplied wax yesterday and it looks like new. So, though not permanent, the black wax seems to do the job. I apply liberal amount and start buffing before it totally dries which makes the job go easier. It doesn't dry white so you don't have the white residue in cracks. This fix last as long as a wax job.