I clean my barrels with milspec grease with this methodolgy.
I want to get the bolt out and a greased patch through the bore within seconds of firing my last shot to get the propellant residue out because when it gets hard you basically have carbon which when it cools down becomes becomes abrasive or in other words you have diamond dust (diamonds are carbon which is he hardest natural substance I know of.
I will use like four patches with 20 to 25 passes on each pass.
Someone mentioned Sweets bore cleaner, and Hoppes No 9 and both are good BUT NOT TOGETHER. This was known in the late 70s when Sweets came on the scene right after the 76 Palma Bi Centennial Match at Camp Perry.I used it for years. Chemists told us they reacted and would cause rust in barrels and just coat them with an oil only.
Now Sweets is expensive and here is an alternative that does the same thing and you can make a gallon of it for the same cost as a bottle of Sweets.
If your local ACE hardware store doesn't stock the "10% Janitor's Strength Ammonia," they can order it for you from their master order book. The stock number for the 1 quart size is ACE10183. It also available in gallons and a gallon was like 5 bucks last I bought it.
Go to Wally World and get same amount of "Sudsy Ammonia". Mix both equal parts. Then add about 4 oz of Ivory Dish detergent. and you have Humpy's White. I made this up after talking to chemists at the local university. The Ivory acts is a surfactant that allows the other two to cling to the surface.
You may not actually need to defoul the barrel as many barrels actually shoot better once they are fouled as many will show fliers for the first few rounds so it may or may not help you to remove the copper.
Once I discovered grease for cleaning my use of Humpy's White went way down unless I get a barrel loaded up with copper.
About 15 years ago a good friend told me his 22-250 barrel was gone on his hunting rifle so it was pulled off and another put on. I asked him for his old barrel and he gave it to me and I looked at it and it really looked bad so I laid the Humpy's to it. Time and again for two weeks and finally got it looking much better. It was put on another rifle and rechambered for same caliber and I went out and shot it and it printed under a inch at 100 yards. I did not have the heart to tell him.
Someone mentioned a problem with a can. While the barrel is hot you might try dipping it in Mobil 1 0W20 Synthetic motor oil as it is 1 attracted to heat and 2. softens carbon.
Here are the procedures for applying milspec grease to patches for 30 cal I use:
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