I am of the opinion that more bores are ruined with cleaning rods than ammo. I have a model 18-4 that has become an experiment. It has well over 1000 rounds since last cleaning and works fine.
I clean them when they get wet, gummy or filthy. Some burned modern powder isn't going to hurt anything. The days of black powder and corrosive primers is gone. If I cleaned my guns every 30 days if I had shot them or not and it took 15 minutes apiece I would spend 40 hours a month just cleaning clean guns.
The I don't wash my car every time I drive it is a good analogy,.
Flame away