Get a 5 gal plastic bucket
Fill it with a couple of gallons of steaming hot water with a generous squirt of dish washing liquad in it
pull your barrel out from the stock.
use the ramrod with swag to run a hot wet patch from muzzel to breach with the breach in the bucket.
Repeat a few times until the stinky rotten eggs come out.
run a dry patch down the barrell to dry it out
wet a cotton ball with oil and run it up & down the barrell. You can leave it in the end of the barrel as a oil plug and blow it out with a cap next time you use it if you like. Personally I dont do that. but will run an oil patch thru before loading up for a hunt.
wipe your whole gun down with an oil rag to keep rust at bay
great mix for ball patch.
1 part ivory dish soap.
1 part mineral oil
1 part hydrogen peroxide