Following Bambislayer's thread, I'm I the only one that has never cleaned my rifle!
I have two, one for seven years, one for 18 years. I shoot between 100-150 deer a year. I have never had to rezero. I check the rifle on a new batch of ammo or an unexpected miss/wounding, but have never had to readjust. Always use the same factory ammo. Rifle has never been carried in a case or slip except on airline flights.
I've never put a cleaning rod through either rifle, though have been known to wipe blood off the barrel.