What is your measurement for "clean"?  No one shooting US made cartridges manufactured in the last fifty years has had to worry about corrosion from smokeless powders or modern primers.  Soot and cooper fouling is the least of our worries when comparing ammo of today to corrosive primers of yesterday in the historical record of fire arms.

Heck I have some guns I've never cleaned.  I just run an oiled patch down the bore.  I read, and found out for myself, you can ruin a barrel running a rod down it too much.  Of course all bets are off if I was some kind of Olympic shooter or some competition shooter.  Then I would clean so well I could eat quiche off the inside of my gun's barrel.

I use jacketed bullets so I don't have to dink with all of that lead bullet lube.  Cleaning is minimal.  I really clean when I can not put ten consecutive cold bore shots in to a six inch paper plate at 300 with my scoped rifles. And that means it is bad.   My Krags?  Well...  SQUIRREL!

::)