Ok, don't everyone gasp in shock all at once... I use armor-all on all the trim around my windows, as well as on the wiper cowl, and the side mirrors (they aren't painted) And I will add that it is a '97 and the window trim has never faded or looked bad. I apply it every so often when I detail the tour.
Don't know how well it will work on already faded trim, but it's worth a try!
