You didn't mention if the exposed unpainted parts of the anodized aluminum grille had polished up nicely or if the anodizing had turned it milky white. If the anodizing has gone bad and needs to be stripped off of the unpainted grille, Blue Lightning makes an anodize remover that I found to be safe and easy to use.
http://www.bluelightningproducts.com/
BLUE LIGHTNING - ANODIZE REMOVER-PT. Spray on anodize remover. Starts to work immediately. No need to mix in warm water and dip the parts like others. Removes anodize coating in 2-5 min. Removes all color anodize coatings. Dissolves the anodizing coating To clean bare metal. Water neutralized No chemical rinse needed. Prepares the metal for polishing, Use Blue Magic Metal Polish. 16oz trigger bottle for $15.95 not $24.95 like others. Recommended by the national Falcon Club and Chevelle Club
Price: $18.95
I used it for the side trim on my 67 Coronet 500, after realizing that a buffing wheel or fine sand paper would take forever on the amount of trim I had. It was the only stuff I've tried that actually works for removing the anodizing. Its easy to use and from my experience, safe as well. It will Not remove anodizing where the part has old paint or road tar on it. (So if your trim has painted details, that would need to be stripped off first.) The key was spraying the stuff on and not letting it dry on the trim till the anodizing has foamed off. Rinsing with water neutralizes the chemical. In some areas where the anodizing seemed especially tough, very fine steel wool rubbed gently on the part while the spray was still foaming, cleaned it up pretty quickly.
