grill metal ???

personally I would see if you can find a place to have them professionally stripped of anodize. If not add +/- 20 hours for sanding plus the price of paper and lots of extra polishing to make them right. When you have them done professionally they are, flaws aside, polish ready. I have several hundred in containers, de-smut and ano/chrome stripper, but that is just not practical for a one time deal.

If you go the other route, only use easy off yellow cap otherwise you're pissing money away. It is the only stuff that really works even if the others contain lye they don't work fer sheet. 2 cans should do it, 3 to be safe.

I use aircraft stripper to pre-clean and remove old paint, undercoat, over spray, etc. just a little bit on a rag and it should all wipe right off.