I used WD40 to remove the mild oxidation on the top of my gen 2 manifold as well as clean the rest of the manifold. I used some scotchbrite pads to do the metal surface and a microfiber to do the painted portion. But the WD40 makes an awesome cleaner and brings the luster back to the manifold..Before picture and the middle fin is an after cleaning with the WD40 and scotchbrite.
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