OregonHunter5
Which powder were you shooting? If you were shooting BH-209, then Hoppes should clean it right up.
If you were shooting T7 - then I would suggest windex to clean - dry the bore - then oil the bore... That is a quick way.
I shoot T7 so I spend time using a lot of just plane soap and water to clean the barrel. If you can find one of the Citrus Cleaners - they are a cleaning soap and degreaser - add to really hot water and mop the barrel - then dry the barrel - make sure it is dry - then oil.
I have a write up some place about this deep cleaning routine but can not put my fingers on it right now.
Cayugad has a very cleaning routing also...
What and where you are describing actually sound something like the 'crud ring' area when shooting T7 and sometimes even the Pyro powders. If that is what it is - then it is best removed with hot water and/or windex... just guessing though..