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Running water for a few seconds while rubbing between fingers for my oh-so-precious 30cal nylon brush (the only one I ever found).
Followed by several days/weeks/months of drying depending on when I'll next fire my beloved SKS or Nagants. All of my bronze brushes have been re-assigned into patch pushing/jag duty and see no "cleaning" of any sort.
Kind of ironic considering that I haven't had a cleaning rod in almost a year since I broke the tip off my last one while trying to hit the "shut up" button on my well-out-of-reach "food detector" AKA smoke detector.
Bore snakes have never been "cleaned" either except maybe once under running water from the faucet then left to dry for the aforementioned days/weeks/months.