Right. I simply run a bore-snake through the breech port every 1000 rounds or so. I have removed the wire brush, first.
I also remove the slide and clean with a toothbrush the parts I can reach, while applying abit of Teflon Spray, also every 1000 rounds.
I shoot everything from CB Caps and Colibris to Mini Mags, the former one-at-a-time. No issues even when I leave the P22 uncleaned over a period of months.
I dislike cleaning too often, because it needs some 25 to 35 rounds all over from scratch before it settles and starts behaving reliably and accurately, again, with the rest of the remaining 965 rounds! So, I wait until I get a sign from it, now, before bothering to clean. It had more than 1500 since the last c-job and it is singing loud and clear.
Crete