I'd never thought of an old case as a rod-guide, great idea .An Army gunsmith once told me humidity (as mentioned by others), is the big problem ,and that barrels left uncleaned hold way more moisture,ie, the residues suck it up over time, then become something nastier than the somewhat inert residue.(artistic-licence with the "somewhat-inert") I clean with patches soaked in spraying thinners until clear, then a well oil-soaked one,and a regular wipe-over outside,with an oily rag. A brush goes through whenever I feel the need, and I degrease bores-bolts etc before hunting. The .22's get way-more use , I only do a hard-out clean on the bore when accuracy drops off, followed by a few shots to settle it down again.
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