What are some suggestions for refinishing the plastic trim below bumpers, over wheel wells, door molding etc. I have seen the "Back to Black" and similar products, but have not used them. I do NOT want to just wipe/spray some product that will make it shine, I want a permanent solution that is satin in appearance when done. Does anyone have experience with any such products? I just bought a CPO 2005 X5 4.4i and most of the plastic trim panels have this faded appearance, which the detail guys fix with some silicone spray that comes off with the next washing. Any direction is appreciated.