Nevr Dull should take care of that. Just make sure the car is absolutely cold when you use it. It works fairly well on the area behind the tips, and is exceptional when used directly on the exhaust tips.
My exhaust is pretty good, but the bottoms of the tips (edge of the holes) are dull and discolored. Nevr-dull did not fix it. In fact, nothing seems to clean it, even steel wool (which is safe on chrome). I didn't even know the exhaust was chrome when I bought the car they were so filthy.
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