[cdowns]

best thing to use to start the polishing of a grill that is still installed would be a brillo soap pad from the supermarket. that will strip off the anodizing and start the cleaning of the grill while still being safe to surrounding finish of the truck// follow up with a good metal polish for a better shine


\i wouldnt be spraying acid all over it with it still attached to the truck, to prevent damage to the painted finish and to avoid residual leftover acid trapped when tryin to rise it off and neutralize it