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I'd use a wadding type metal polish like NevrDull, a little easier than a liquid polish, especially in tight spaces like the exhaust tips and it's always worked well for me. I heard years ago that NevrDull can put fine scratches in chrome though so I've avoided using it on chrome just to be safe. It's a kind of metallic colored tin, you should be able to find it at Walmart or any autoparts store.