Getting ready to Dyna-Tek a shotgun and I can't believe how long it is taking to get to bare metal. I have used so far, Carb Cleaner, Hoppes #9, Flitz, 2 ATF & Solvent soaks, Marvel Mystery Oil, steel wool wrapped brush, JB bore compound. This is on a chrome lined barrel that looked clean when I started. My only guess is that it is successive layers of plastic and carbon lining the bore like the rings on a tree.

This one is almost done after 48 hrs. but I have six more to go. I think I will patch, then soak, then hook up a steel wool brush coated with JB to a drill, then do boiling soapy water, and hopefully only repeat once more. Then Carb Cleaner, dry patch, alcohol patch, then dry patch. Does this sound like a reasonable plan?

Any thoughts or suggestions?

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli