Newbie with a few questions. The engine bay and trunk in my car are polished aluminum. I've kept them clean but after a few seasons on the road and the panels have lost some luster. Can anyone recommend a good product to bring them back? What about a good seal to keep the maintenance down. I'd read somewhere about a product called Shark Skin. She's buttoned up in a cold garage right now and I don't feel like going out to take some shots but here's a picture of the chassis before the skin went on to give you an idea of what I mean.