The bluing was fine, but the unblued parts of the frame came out as bare metal.
I don't believe it is advisable to put anything in an ultrasonic cleaner unless the information that comes with the cleaner specifically states that it is acceptable.Has anyone tried water with 5% ballistol as a cleaning medium ?
I'm not an expert on ultrasonic cleaners but I don't think that putting oil in one is a great idea.Ballistol.
It's an old-school german military gun oil, sort of the first CLP or wonder lube.
Tom2
....And the makers of the tanks I use also specifically forbid any sort of flammable solvents that might vaporise in their tanks. Even alcohol.