Rim-fire is a MUST clean suppressor. The performance degrades when the volume decreases. Its been proven time and time again. As well as centerfire pistol cans. John @ silencerresearch.com tested a used trident9 vs his used one and the difference is astonishing, from the build up of carbon on the baffles.
The only can you dont need to clean is a centerfire rifle can, the temps are very high and thus do a great job at keeping things tidy inside. Of course you need to keep carbon off of the quick attach mounts but the can baffles themselves are fine as is.