I suspect that maybe the case with Hoppes and Sweets, but Boretech Copper is the best and seems to be going good after some time. I have decanted it into a smaller bottle and top it up occasionally from the larger one meaning the larger one gets opened rarely hopefully preserving it. That may be quite incorrect as I suspect it is chemically constituted and there are no solvents to evaporate, however I will continue to decant it.
Interestingly the Sweets being ammonia based still is quite pungent, but largely ineffective or noticeably slower when used on a cotton bud on copper at the muzzle while Boretech removes it very effectively and quickly....a good test.
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