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I think some people are making this out to be an issue, when it is nothing more than ordinary routine cleaning. The pictures that the OP posted were extreme and illustrate what happens to bare aluminum when it is neglected. Ordinary routine care can prevent this from happening.
I would expect that responsible owners perform some type of periodic cleaning, either on a schedule, or as needed. All that is required to keep the exhaust from being embarrassingly dirty is to clean it at the same time. A two minute wipe with any of the mentioned products will do the trick. I can't imagine someone cleaning their bike, and then bypassing the tips because it is an exhaust. Even the Dr. Who pipes require cleaning.
The product Czarcasm mentioned is probably the most gentle on metal. It would be difficult to categorize it as an abrasive because it relies on the solvents in it to remove surface oxidization. Just wear rubber gloves because it really does pull the black oxidization out and it will soak into your hands. The other products vary in abrasive grade.
Wolf's advice on cleaning the tips is spot on, but IMO, it applies to ordinary surface deposits and mild surface corrosion. If the tips in the pictures are as pitted as they seem to be, they will need more aggressive treatment.
SeaTac should try cleaning them up as Wolf suggests, and if that does not work, take them to a professional. I feel certain they will want the tips removed from the cans.
In any case, a cute little Dremel is not going to do the job, and could make it worse.
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Oldndumb
Caveat lector
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