chrome trim has gone milky?

[Nollywood]

The only way to get the trims shiny once more, is to remove the protective lacquer, then polish the raw aluminium to a bright finish.

The problem is once the lacquer's removed, you'll have to keep on top of your polishing. It may however be possible to purchase clear vinyl, and cover the fresh aluminium, protecting it from the elements. (Audi use it on lower areas of the rear wheel arches on certain models vulnerable to stone / grit chipping).