I've done some "perceived" sacrilege cleaning BP guns & other a sundried items ....
I recall cleaning the fuel Injection on my TR6 race car in a Howard Johnson's motel bathtub at a Daytona Sports car race.
Circa 1973 .... that left a ring I can tell you ...
I use to pull the barrel of my smoke pole and stick the breach in a toilet and siphon & flush the bore with a patched rod
flush the carbon down the drain... nice sooty residue in the bowl after that
I'd heat water add Dawn swab the bore & cylinders on my C&B's rinse with more hot water so the evaporation of moisture was faster.
I used Moble 1 , and other lubes.... I still have Gibbs Lube , EeZox, Boshield for the Smokeless shooters...
I lke Ballistol on my original guns because it will not build up in the wood & I use it on my Leather ....