You'll find the Bore Tech dramatically faster than either ammoniated or ammonium oleate-based cleaners. It uses a chelating compound like EDTA to do the job.
The fastest copper remover I've encountered is KG-12, which seems to combine chelating and a small amount of ammonia. But it has two drawbacks. One is that it doesn't turn blue or green, so you can't tell by its color when the cleaning is done. You want to have a borescope to check or you want to follow up with another cleaner that changes color to prove the copper is gone. Second, a couple of folks have said it is hard on some finishes, so you want to test it on a hidden spot somewhere. But man, it eats copper fast. Wet a bore with it and plug the ends and come back half an hour later. Only the worst fouling will need any more time.
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