I forgot that Muddyboots!One more comment, NOT ALL BORE CLEANERS can be left in the bore for long periods of time like Hoppes9. Be careful if soaking bore with a bore cleaner that just might wreck it if left in for any period of time. Copper cleaners typically have very short time span in bore due to their chemical compositions.
Anything with ammonia should not be left in the bore very long.Maybe more as my memory is not great.Possibly some others so read labels and make sure it's ok to leave overnight.