We have a 2015 BMW 328i. The black trim around the side window, specifically the trim at the back edge of the front side windows and the leading edge of the rear side windows, is impregnated with white wax residue. I have tried the usual methods of cleaning the trim with no success (simple green, wax remover, black wow cleaner, etc.). Any suggestion? The rest of the car looks great, black, but the window trim is really taking away from the detailed look. Thanks Phil