I posted on the other thread showing what a good cleaning does in terms of POI with my rifle. I should also point out that some time back I took the decision to give my rifle a really serious cleaning and I used some KG12 to get the copper out. It was a long story but the bottom line was that it took me about 50 rounds to get my poor rifle back to shooting consistently. The groups weren't bad and they weren't miles away from my point of aim but they weren't as good as they should have been.
So, be careful. Every time the rifle is out, and when I take it out of the safe again to take it out, I will put a tight dry patch down the barrel. Part of this is a routine to ensure there is nothing in the barrel that might cause a blockage hence why I put the patch up it when taking it out of the safe but it is also to ensure there is no dampness or loose material left in the barrel. I always store the rifle with the moderator off. Once in a while I will put the brass brush up the bore with butches bore shine on it. I only pass the brush up in one direction and after getting lots of butches into the barrel I would let it sit for a little while and then patch it out. I might give it another going over with butches and the brass brush and patch dry. That is what I consider the maximum level of cleaning it gets but I am pretty certain that going at it for longer, with different chemicals etc. will remove more dirt but I can see no advantage in terms of accuracy in doing this, in fact it has a negative effect on accuracy.
How often? Well if I go to the range and shoot 50 or 100 rounds then I will usually clean when I get home. If I am stalking then the rifle can go several months with no more than a dry patch down it and to date I've seen no problem with this and it means that I know where not only the first shot out of the barrel will go, but also where a group of 10 or even 20 shots will go. When stalking I might commonly put up a target for a wee practise off sticks and so on so I'd guess that the rifle might be cleaned every 50 - 100 rounds but those would be fired over quite a few months, maybe 3 - 6 months.