So, how do you get it out?
I did the unpardonable sin of shooting plastic shotcups over fiber wads and blackpowder. I assumed that the fiber and nitro wads would prevent the plastic from melting to the barrel. It appears that assumption might be wrong.
I did shoot smokeless loads over the top of the fouling and perhaps that is where the problem lies but I doubt it. Meanwhile, I gotta get this stuff out.
I'm currently soaking with Kroil and then brushing and repeat. Progress is being made but it is VERY slow.
Any suggestions?