I made up a solution that I sprayed onto all of my BP firearms between each stage/scenario.
This was a 16 oz bottle of Murphy's oil soap, a 16 ox bottle of rubbing alcohol in a gal. jug of water. (NO! hydrogen peroxide!)
I would give everything a squirt after each stage. Rifles were turned muzzle down to allow to drain out of the muzzle end. (nothing drain into the receiver area)
Pistols were squirted down and excess wiped off with a clean cloth.
All of this only took a few seconds And is a system that has always worked well for me.
(other views may vary)