After 40+ years of shooting various traditional bp firearms I finally fell back on my KISS rule.
For the C&B revolvers, I never fully disassembled for cleaning and never had a problem.
I remove cylinder and other easy to remove parts, like the loading lever on the Ruger OA. I plunge the whole works, sans grips, into a small tub of soapy water. The soap is not some magic formula, just whatever happens to be at the back of the sink at the moment, or sometimes car wash soap. I'll use an old toothbrush to get at the exposed crevices, like around the caps. I'll use a patched jag inside the cylinders and plunge back and forth under the soap solution a few times. This eliminates the need to remove the nipples. Repeat in barrel. Then I'll use running water (kitchen sink, garden hose, whatever is handy) to rinse out the inside. I'll let dry or even put on an oven rack at low heat. When dry I'll use either aerosol carburetor cleaner or WD-40 to squirt hidden crud from the inside. And, finally, when all is really dry I lube moving parts with a good lube like Break-Free although WD-40 has served me well many times.
Now, do not be mislead into thinking I am not careful about how I clean these. To the contrary. I am very thorough. That is the key. Using special mystical cleaners is not necessary as BP residue cleans 90% with water only, the soap, or whatever, removes the rest.
There is no need to get anal over this process. Just be prompt after a shooting session and be thorough.