[Al-53]

A good metal polish thats non abrasive but a chemical cleaner is Blue Magic Metal Polish..it does a nice job on oxidation and tarnished metals..I got a few samples from the car show and sent one to Sparkie and kept 2 for my self..I did some polishingon my Son's Motorcycle and it cleaned the aluminum up real nice

here is some info on it....stuff does work..and is paint safe also....

CarGo Blue Magic

and best part its not expensive for a product that works..

AL

[scheerspeed]

i think im going to just use billet

[P1et]

If you have a Williams Sonoma near your house, pop by there and pick up some Wenol... Top stuff!

[joep]

as AL mentioned blue magic metal polish is an excellent polish and you can but it OTC..you might want to try some steelwool #OOOO first followed up with a non abrassive polish..

[devast8]

I also use Blue Magic. Work awesome. I use this for tailpipes and exhaust. Cheap and VERY effective!

For finer polish, like on a motorbike for example, I use English Custom. I have 3 of there polishes and it deliver! Costly but if you want something show worthy they are worth it imo. I wouldn't use this on tailpipes and places that would be dirty the next day though

[Calogero]

I will post an engine detail I did for a Ford Mustang with a write up later.

Hopefully this will give you an idea and help you out.