Oven cleaner is a strong caustic. Don't leave it on too long or you may have pitting to polish out. Anodize can be removed with 220-400 grit sandpaper, prior to polishing, also. With professional buffing equipment, it can even be buffed off with a coarse compound.

Those contemplating the removal of the original anodize and polishing parts should know that the polished parts will tarnish and corrode much faster than before, requiring periodic applications of polish like Mother's and/or automotive cleaner/wax products to keep the parts looking good.

Some alloys are more corrosion resistant than others. The 7075 alloy used for chainrings isn't nearly as tarnish resistant as 6061. Items like stems and brake will be made of other alloys suited to casting and forging.