That is why you pump soap and water through the barrel with a good cleaning jag on your rod, and a proper sized cleaning patch. The pressure of the water, and the water being a solvent, removes the crud to which you refer. A Breech plug cleaner, which looks like a wide screwdriver blade, can also be used to get the junk caked in the corners out. I just pour water and soap in the barrel, and let it sit awhile, while I clean other parts of my gun, such as the action and nipple. The soak lets the soap do its work, and the water to penetrate the crud, and loosen it up. The pumping action forces water past the crud at high speed, pulling the crud away with the vacuum created.
If the last thing you do at the range before going home is put some cleaning solvent on a cleaning patch and wipe down the bore, leaving the patch and rod in the barrel for the trip home, the crud is usually dissolved and ready to come out easily when you do get to cleaning the barrel. I would recommend Hoppe's No. 9 Black Powder solvent and cleaner to you, or go up to the member resources and find the recipes for Stumpy's Moose juice. Both do outstanding work as cleaners. Stumpy's is cheaper because you make it up from products you may already have in your home. If you don't have an old bottle of Castor Oil in the medicine cabinet, use olive oil, or cooking oil as a substitute. Ballistol also works well, if you already have that. A quart jar of the Juice takes very few materials except water, and will last you a couple of years of normal shooting.
For a really caked on crud barrel, don't hesitate to leave it soak over night, or put a DROP of Hydrogen Pyroxide in the bottle. That will agressively attack the crud and remove it quickly. Don't overdo the Hydrogen Pyroxide, as it is highly corrosive, and will pit the barrel if you overdo it.
I have a recipe that calls for one fluid ounce of liquid dish soap, one fluid ounce of Hydrogen Pyroxide, 2 oz. of water soluable oil, and the remaining 26 oz being tap water. I think that is too much Hydrogen Pyroxide to use in that mix, and would cut it to 1/4 of that, or even less. A little goes a long way. A pint bottle of Hydrogen Pyroxide can be bought at drugs stores, and in most grocery stores for less than one dollar. Many poeple keep a bottle of it in the medicine chest to help clean out scrapes and wounds.
