Err. I'm going to be the odd one out here.
Metal sliding against metal is bad juju. And since all the sears/levers etc are the same hardness, there's no one "wear point" which probably means the pins, and even the housing, become the wear element.
I hose out with brake cleaner.
Acetone, butane, naptha (lighter fluids), carb cleaner, isopropyl, moonshine etc would all work much the same.
I lube with a few drops of hoppes 9.
Other options would be lanolin, ATF, PTFE, whale blubber, bacon grease, the tears of elves...
Anything in there has the potential to hold grit. And any grit in there will act as grinding paste.
All my guns are hunt guns, that is, in the bush, dirt, snow, sand, and this isn't a problem. I don't see possibly how it could be for BR shooters.