After reading through the forums here, I tried some stuff called "Refinish/Restorer" by Car Systems. It appears to be a German product with only 1 importer out in California. You will find many other posts about it on cladding cleaners here on the site.
This stuff is amazing! I wish I had before/after pictures. My wife wants me to do the small cladding on her Mini-Cooper after seeing the results, which is saying something! We also did a bud's older K-5 Blazer with similar results.
The company that sells it is Diteck, I think. They are an auto shop supplier. You will find links on other forums here. It costs about $48 after shipping and comes in a 1 liter can. As near as I can tell, this 1 liter can will last me about 10 years!
I used a paint brush to put it on, but I see others have used a sponge, which might work better. You just brush on a very thin coat and let it dry. It worked so well, I tried it on my spoiler, mirror caps, and hood inset. It restored ALL of them to showroom condition.
It doesn't remove the scratches, but makes the finish look new, so the scratches don't show, unless you really look close. And I mean close!
As you can see, I am a fan of it. Check some of the other threads here, some have posted photos. Good luck!
Robert