Found a good exhaust cleaner
 

My exhaust was looking kinda dirty and bronze, so I got some Eagle One Nevr dull metal polish. It didn't really take the bronze out or make the exhaust shinier, but it did remove the rust that had built up around the 'thermal' etching on the tip. It's a good product for restoration and getting rid of rust. Now I just need something for the bronze color inside.

you can also use SOS pads to take the rust off. For Aluminum polish I like to use Mothers...I know the Never dull wadding...It works pretty well on some things.

sweet dude... mine is startin to rust a little bit..

Wizards is also really good for that.