Lint, skin oil, itty-bitty skin flakes (ick!), and sweat are way worse than carbon and copper. Wearing a gun all the time also leads to finding occasional traces of the R-word in the deepest nooks and crannies alongside the sights and inside the hex-holes in the grip screws. Utterly horrifying to a clean-gun-freak like me. Not even a day at gun school shooting hundreds of rounds makes that much of a mess.
I use a piece of paracord when field-stripping as no-idiot-mark insurance.
Every so often I grit my teeth, hold my nose, and let my gun actually get dirty as a test of reliability. I certainly don't have time to clean it every day other than maybe a quick spritz of Tetra Gun Spray and a wipe-down. If getting a little gunky causes malfunctions, I need to know -- and probably would opt to carry a more-tolerant gun for self defense. Fortunately, so far my Wilson has run like a champ even when less than pristine.
Every time I unload my carry gun, I rotate the chambered round into the magazine to avoid possible setback. When all nine rounds have been chambered once, I shoot out my carry loads. The two spares I carry just get checked for hairballs. Maybe once a year I'll burn through all of them, swap the mags, and start over.
Yeah, I know there are plenty of folks who clean their carry guns seldom or never, and those guns will probably go bang if needed, especially if they're Glocks or wheelguns. Me, I just have to treat the thing like my life might depend on it some day.
With all this
Did I mention there's still an escaped HK P7M8 magazine spring lurking somewhere in my house?