You are going to want to strip and repolish the aluminum before going back to the anodizer. The polish shop can probably do it for you, or you can use oven cleaner, making sure to follow directions about gloves and such, the stuff is pretty caustic, will cause burns. I thought I had pretty tough hands when I was removing some of the lettering off my boat with the stuff, proved to be a mistake on my part, keep the stuff off your skin.