The grille on my GMC Envoy has a body color surround with chrome trim, but the center of the grille surrounding the "GMC" badge is black. With exposure to sunlight over the years, the black trim is slowly turning grayish white. I can keep applying something like Mothers VLR, which restores it back to black for a while, but I was hoping there is something more long term. There's handful of "Back to Black" products out there, and I was looking at Mother Back-to-Black Heavy Duty Trim Cleaner Kit. But short of painting the black center, Plasti Dip, or going as far as replacing the grille, what product, in BITOG's experiences, is decent to restore oxidized plastic? Thanks!