I've been using 303 Protectant, works great on the black trim. Seems to remove the white wax residue very well, plus gets all the water spots off the trim too.
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Ditto. I had some wax on the plastics and the 303 took it off and it seems to be permanent. This is one of the most recommended products in the car detailing forums. It isn't super shiny like some of the plastic/rubber protectants but I think this is good thing. It doesn't seem to attract dirt and dust like other products.