Lever gun clean up is actually really easy. My Uberti (copy of 1873 Winchester) is a pinch to clean because the 44-40 cartridge is bottle necked, thus there is no blow back into the lever action works. After firing 50 rounds, I only have to clean the barrel; the breech and lever works stay clean. I clean those parts once a year.
Hot water is the key to black powder clean up. I do not use black powder gun cleaning solvents (like Hoppes), that only makes cleaning more of a chore. With my revolvers, I pull the cylinder and then hold the revolver barrel under the hot water tap in the sink and then wipe it dry with a few patches. Same with the cylinder. Hold it under hot water then swab with dry patches. Finish off the inside of the barrel and cylindars with a swab of Crisco cooking oil to protect from rust. It is actually less work than cleaning up a firearm that fires smokeless powder.
My .50 cal flintlock is actually a little more work though, but only because I have to remove the lock to totally clean it. Even when I have to take my revolvers apart for total cleaning once a year it is quite easy (I fire about 1,000 rounds per year out of each one). The picture below shows one of my Remington revolvers totally disassembled for yearly total cleaning. An easy task.
