Once aluminium has been anodised it can't be redone. The process is a controlled chemical corrosion which leaves a tough protective layer on the surface. A colour dye can be added during this process. To allow the process to be redone would require that the anodised surface be removed back to the raw aluminium. It may be only 10 to 15 microns thick but getting that off evenly without destroying the smoothness of the finish would be difficult. Obviously not viable for a grille!
Soda blast and paint, cheap and easy.
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