Two part question: cleaning and "frosting"

[Andy]

I have a two part question. The first is the dreaded cleaning routine. What do you do? Here's mine

1. Scrub barrel with a bronze/brass brush BEFORE any solvent (a la' the Brits)
2. Wrap cotton cloth around said brush and soak with solvent (Shooters Choice and others) and brush copiously maybe more than a few times and let sit
3. Repeat #2 with dry cloths until they come out clean
4. Swear like a drunken sailor because they NEVER come out clean
5. Spray with Ballistol
6. Fresh cloth around brass/bronze brush and run until dry/soaked

NB: I use flannel or T's cut big, like 5x5" I like a tight fit

Question 2: What in the hell is barrel "frosting"? I have a 16 I've cleaned the hell out of and in front of the chamber are linear streaks that I cannot remove. I'm not sure what that is. I can ONLY see it with my glasses off (I'm very near sighted) or with a loupe, but they're very obvious. I've used a lot of wad solvent and can't get them out.