I put a stack flannel patches in one of those zip loc bowls an add anti freeze. The patches soak all the anti freeze up.
Then to clean the small cannon I wrap a patch around a bore brush and run it up and down the bore a couple of times to gather heavy stuff in the patch. Then run one clean anti freeze damp patch in and out and change patch, one clean patch for each shoot fired plus patches until the patches come out clean. For the 1 inch gun, I wrap the patch around my mop and hold the patch on with rubber band and clean the same way. Be sure when you put the patch on, that you let it over hang the end so you get the bottom of the bore. You will be surprised how quick it is to clean this way.
When the patches come out clean, which doesn't take long, then I dry the bore. The I run a patch soaked in NAPA ATF in the bore to oil.
Use a pipe cleaner for the vent.
I make my own patches from diaper flannel. I have one of those gray cutting mats, a straight edge and roller cutter like the quilters use to cut my patches.
Read the label on the antifreeze and you will see that it has all sorts of rust and corrosion inhibitors designed for use on brass, alumimum, iron and steel. Same with the NAPA ATF.
I use this method on my Martini's also. I push the wet patch through from the muzzle and let the patch drop out the chamber. Then I wipe the chamber out using a flexible rod for cleaning shotgun chambers with a patch wrapped around the 20 guage chamber brush.
Gather up the dirty patches patches and toss in the trash.
Any Paul Matthew's fans here, that's where I got it. No big mess and scald burns and done 1/4 the time. My carriage doesn't get water soaked and no rust spots from the one you missed.
I also use these wet patches when I swab between shots in the small cannon at the club matches. Wet patch, dry patch. plug the vent, add powder, wad, ball, prime and fire!!! When I get home I am going to start using it on the 1 inch between shots.