--------------------------------------------------------------------------------------------------------------------------------------------I'm very surprised that I'm the only one so far that has said that they don't need cleaning. Granted, I don't shoot nearly as much as many others, but I've never had a gun stop working due to being dirty. I'm not an expert shot, but I've also never noticed any degradation in accuracy from unclean bores.
I wipe them down after each use with a lightly oiled rag to ward off rust, and maybe a pull through with a lightly oiled bore snake if they'll be sitting for a good while. Otherwise they're left alone.
The last time I cleaned a gun was actually somewhat recently. I cleaned up the bolt, breech face, and receiver of my 10-22, simply because I wanted to see what it looked like clean. Didn't touch the bore.
Actually, .22 LR bores are pretty much self-cleaning. The problem of corrosion begins with copper-jacketed bullets shot from centerfires. Unlike lead bullets, which are wax lubricated, centerfire jacketed bullets leave a coating that doesn't protect bores, in fact, it leaves them dry and naked to corrosion from humid conditions. When I was younger, I forgot to clean my varmint rifle after the season and months later, tried to look down the bore and could barely see through it due to Rust! I had intended to keep using the rifle through that varmint season, but with new babies, forgot all about it. By the time I woke up and tried to look through the bore, I could barely see light through it. In a PANIC, I worked hard and long to soften the corrosion, so I could get a cleaning rod through it. I finally did, but the bore was badly corroded. I took it to the range, expecting to see the effects on grouping ability, or tumbling, but it shot just as well as before!!! Still, it had a rough bore and would accumulate copper jacket material, so got rid of it to someone who wanted a cheap varmint rifle.