Hoppes 9+ does a decent job, but I don't think I've ever gotten one **** 'n' span with it, and it alone.
I do want to try the Windex idea. I like that one.
I DO take the pins out of my traditional rifles, at the guidance of the rifle maker who made them. My 62 is in my hands 3 years now, been taken down a fair amount, and the holes are very snug. I asked him about the holes getting bigger from taking it down frequently, and he said, "then you bring it to me and I'll make them a smidge bigger." Since it's 3 years, lots of shooting, and they're nowhere near loosening up, I'd say it'll be ok.
I tried the Chambers flush kit, and the construction of the rifles won't let it sit square enough to seal.
I do want to try the toothpick plug for water and also windex, just to save the time of pulling the gun down.
For my current method, lukewarm water with a drop or two of Dawn....swab clean, swab dry, WD40, then swab dry from that. Nothing more.
Check the bore occasionally for any issues. So far, none. I leave them all year like that, although I shoot weekly through April, then I try to shoot periodically after that, so they never sit for a year unused.