Removing anodized coating

have you tried to find a place that does anodizing? they can also remove it. I have studied this when I was doing mine and it seems that they need to strip them with like products thickness etc and you will also need to strip the grilles down. remove the rivets etc I have all new rivets for when I do mine. once they strip them do the resto on the grilles and have them re-anodized

A problem I read with using Drano and such is it is very caustic and can discolor and/or destroy the alum.