Exhaust / Header Cleaning

I have an alluminzed TTI exhaust that has some significant staining and oil residue on the pipes. Does anyone have any secret cleaning solutions to make this come off easier ie solvents, degreasers etc? I also have jet coated headers with similar issues that need some attention.

http://chucker54.stores.yahoo.net/cecepo.html this is good product, but if it is really burnt on I don't know of anything..pat

I used simple green full strength on my TTIs which are coated. Now, the burned oil was not there long, but it cleaned it up pretty well.

Best thing I've found on my coated TTI's for oil stains is Eagle Never Dull.