We did the same thing with one of my PSAs over this past summer it had roughly 6000-8000 rds of steel cased thru it, we quit counting after we had 5800 rds thru it , never been cleaned besides the initial cleaning when new , just oiled and ran . Never one issue with all those rounds , it was beyond nasty from all the carbon and oil build up , I really felt kind of guilty to treat her like the red headed step child , but it was one of those things you just want to do to see how far you can go before it quits and that's what we intended on doing . Well since ammo has gotten short and stupid priced , we have decided to quit and give the ol girl a douching . She looks like new again , shes had all her guts removed , cleaned and replaced , and right back in the safe with the rest of the queensI have an AR I refuse to clean, just because I want to see how nasty it will get before it gives me problems.
My other rifles get CLP and Hoppes.