Hey, I've owned an auto detailing company for 7 years, tried it all on the old silver trim. No Luck. Polishes, compounds, silicones, waxes, to no avail. Sorry buddy, if the rest of the truck is all trimmed out and this is a sore thumb, try replaceing the metal work around the window, it's fairly easy and you can get the metal from a good truck accessories catalog like JC-W or something... best of luck- Jo