It would interesting to note how many people posting have a bore scope.
I have one.
That being said, I don't go for a completely clean barrel as most do; never understood that logic. A little fouling is a good thing as far as accuracy is concerned.
24HCF in its entirety, is solely responsible for why my children do not have college funds, my mortgage isn't paid-off and why I will never retire early enough to enjoy the remainder of my life.