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For stainless pipes, oven cleaner works best for me. After protecting the body paint by covering the sides of the car behind the pipes with aluminum foil secured with masking tape--got if from the kitchen--I coat the pipes with the oven cleaner. I then get the pipes really hot by running the engine so the cleaner can do its job. After they have cooled, I wipe the cleaner off to expose the clean pipes. I do like the straw discoloration of the stainless pipes, though. It doesn't take long for the color to come back.
As for how oven cleaner works on ceramic-coated pipes, I don't know. But it works so well on stainless, I'd give it a try on a spot underneath.
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Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
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