I don't clean ANY of my .22LR rifle bores anymore--I make it a point NOT to--with the exception of my AR that I run the M261 conversion in. That one gets brushed out and then a couple rounds of 5.56 shot through to clean out the gas system every 1000 rounds or so.
I DO make it a point to swab out the chambers of most of my semiauto .22 rifles about every 400-500 rounds or so. On some of them, this is absolutely critical. Others, like my 10/22, don't even need this to keep running 100%.
I clean the bores of my .22 auto handguns at the end of every year, mainly because it's no more trouble to brush out the bore than to try to just clean the chamber.
My .22 DA revolvers (five of them) get their chambers brushed out every 150 rounds, and the extractor star gets cleaned under at the same interval. This is absolutely necessary for proper functioning.