I just spoke with a very helpful and informed rep from Brownells. He said the solution they market under their own name is very similar to Pilkingtons (and about 1/3 the price). He also suggested using a quick acting agent, like Mark Lee (which I usually use for small parts) for the first pass over that problem area because it etches the metal slightly, then going back and finishing up with the Pilkingtons. Thanks to all for the suggestions!

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