My upper plenum has some discolering spots and it isn't very shiny. I plan to get it polished to a mirror finish later by professionals. But for now I have a quick question, What product should I pick up from the local Pep Boys to start cleaning my plenum? Any help is appreciated.

Thanks,
Dan

 

It's oxidation. Nothing I know of will remove it other than invasive polishing...

 

This thread needs some photos.

 

Thanks for the reply. Ok, ok. Davidv, what did I do now to get the infamous picture. So what people are telling me is, theres no way to get rid of all the discoloring on the plenum, unless I polish it to a mirror finish? My car only has 24,000 miles on it. It was used so i didnt get to take car of it untill about 18,000 miles. I wish I could have though.