The moldings are anodized aluminum. The anodizing is so hard that it is almost impossible to polish. I have tried with no luck (on an anodized headlight bezel). Now, the anodizing can be chemically removed and the moldings straightened/polished. However, IMO they will not look correct. I had a set stripped & polished, but they just looked to shiney. The original anodizing has a slightly dull look to it.
I ended up going with a set of really old NOS moldings that I found about 7 years ago for $150. Luckily, when I unwrapped them they were in perfect shape.