Quoted from KSUWildcatFan:Nevr Dull is great stuff! I actually just used a Scotch Brite pad on my trough parts this time, I assume some time down the road I'll have to do it again and maybe use Nevr Dull or something else..or clearcoat..because it'll oxidize again. All of these old stern parts do it since they didn't coat them.
Bring your sheet metal down here and shine them up with my buffer. Then hit them with some spray can clear. They will stay shiny for a long time.