I do not fully dissassemble my C&B revolvers to clean them every time I shoot them.
My cleaning envolves removing the barrel, cylinder and nipples if it is a Colt style open top or, removing the cylinder and nipples if it is a Remington style.
I use a damp rag to wipe the fouling off of the frame, hammer and exposed parts of the cylinder pin, cylinder stop and hand.
To prevent corrosion of the steel parts down in the frame I spray some Barricade thru the trigger slot, the hand slot, the cylinder lock slot and into the area around the base of the hammer.
Once a year I will totally disassemble the gun to wipe off any oily fouling that may have accumulated inside the frame.
I have never seen any rust on these internal parts during this once a year cleaning and based on this I feel I can say that even cleaning them once a year is probably more often than is really needed.