Dup, you ever tried Wonder Wheels on your car? It's pretty agressive stuff (so don't leave it on for too long) but it doesn't half get ALL of the ingrained crap off!
Also, I'd try Autosol for cleaning the exhaust. Very very good stuff! Beats any other metal polish IMO.

Also, I'd try Autosol for cleaning the exhaust. Very very good stuff! Beats any other metal polish IMO.

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