Okay here goes.

All I use to clean may black powder Martini's is straight Prestone antifreeze. Anti freeze contains anticorrosives and glycol. I run patches down the bore until they come out clean. I wipe the exterior surface and interior parts down with antifreeze soaked patches. The wipe every thing dry with with clean rags.

Then I wipe bore, exterior and interior down with NAPA ATF5. ATF5 also has anti corrosives in it.

I just visited my rifles last week that have been in storage for the past two years while I was in South Africa. Not one speck of Rust or corrosion anywhere.

Usually when I post this about using anti freeze someone comes on and post what a fool I am for using such a dangerous poisonous product like antifreeze that will kill small children and dogs. Just like any cleaning material when you have pets or children you must use resonalble percautions.