Just my opinion, and repeating what's already been said, the oven cleaner may remove the anodizing, but you're going to potentially have a huge problem on your hands. It can mess up the aluminum, might leave it blotchy, any number of things. And it will hurt your paint too if you get any on it. Then, you will have to polish the newly-stripped trim for it to look good, and will then need to continue polishing it as previously mentioned, forever. I would HIGHLY recommend experimenting on a spare piece of trim OFF of the car, and if you like the results, then remove the rest of the trim you want to work on from the car and work on it OFF of the car. What we're talking about though is not the ideal solution. The ideal solution is to remove all the trim and have it professionally stripped and re-anodized. I had a situation where I HAD to get this done on a piece of trim. The price was so high that I now just smile and move along when I see the rainbow thing you're talking about.