This is some thing I suppose every one has developed or had taught a way, it sounds like mine might be just a little different, it was taught to me by my Grandfather who still had muzzleloaders.
Take boiling water and clean every thing so no dirtor oil remains let cool after reassmbling till its just good and warm but completely dry, load after loading run a lightly oiled patch down the barrel to the top of the load the use it to wipe down the out side of the gun. It gets fairly cold in northern IL. and according to his ideas you do not oil the action of any gun when its cold. He taught me to wipe the threads on breach plug and nipple with bees waxand use a bit of bees wax in the mixture [certain herbs and a bit of coon grease that we made for our Patches [ around the ball] I never had one loaded for hunting like this fail.
one of the things that concerns me about inlines is the fact that the sabot dont seal moisture out so I put a finger cot or some ballons I got a hold of that are just the right size and put some bees wax around the 209 in all weather so it can not draw moisture, so far so good. Lee