There may be some truth to centerfire cans not needing to be cleaned, but that is definitely not the case with rimfire.
DPT rimfire needs a good clean every 1000 shots or so, otherwise it becomes full up with carp and starts effecting accuracy and makes subsonic ammo start going supersonic.
I had both my 22s start giving me accuracy issues at the same time, eventually worked out the dirty suppressor was the cause of my inaccuracy, fliers and change in POI.
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