I clean my Marlin 60's every 100,000 rounds whether they need it or not. Seriously a .22 does not require being cleaned after every shooting. I went 11 years without cleaning the action of my old Marlin 60. I have NEVER put any oil on the action. It is starting to slow down and not function exactly right now. But I've shot 150,000 rounds through it. It worked perfect until I was cleaning the action and got one of the springs just a little out of alignment. It has had problems since then so I'd have to say it was really my fault it doesn't work right because I cleaned it when it didn't really need it. And I've never put one drop of oil on the action ever in all the time I've owned it. Oil collects powder residue. You will more problems from the oil than you do from the powder. If I clean the action I just brush it off.
All of my .22's shoot more accurate with a fouled bore. Some are extremely more accurate that way. If I clean my Savage I have to shoot about 100 rounds before it comes close to being as accurate as it was before I cleaned it. And I shoot Wolf almost exclusively in it. Wolf .22 ammo is not very dirty at all IMO. Remington is horrible. Federal has gotten really bad in the last couple of years too. It used to be really good but that seems to be over. Thank the people who elected our current president for that. Because of the hoarding of ammo and the resulting shortages companies started reducing quality control or at least some companies did. Federal was one of those companies. It will be years before I buy any more of their ammo and I shot very little else for probably 20 years. My Marlin 60 loved it. Not now. It gums up everything I put it in. CCI is the best bulk ammo now IMO. It works well in my Savage, my CZ, all 4 of my Marlins, my Stevens, and everything I try it in pretty much.