The Wax Depot makes a product called Trim Dressing , www.waxdepot.com
1 (800) 336 - 4379 This and most of their products are used by professional detailers and Concourse people . There is a photograph of the bottle in my gallery on page #5 photo #3 .
A little of this product goes a long way and is best applied with a small foam applicator , if you have heavy oxidation apply more liberally , wait a couple of hours and wipe of the excess . works on any and all of your Black trim .