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I used to shoot a black powder .45-2 7/8 Sharps (about 90 grs of FFg). To maintain the cartridge cases, I would take a large peanut butter jar half full of soapy water to the range with me. Immediately after extracting the fired case, I'd drop it in the jar. Returning home, I would wash the cases in hot soapy water and scrub them out with a small bottle brush. The sulfur in the powder and residue are corrosive to brass and steel (as noted above, it makes sulfuric acid). In the old days, primers contained mercury (fulminate of mercury) which severely deteriorated the brass; coupled with powder residue it made a real mess and case life was very short.
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