No matter where you stand on 'Carbon Ring' here's some info I've found from another forum. It involves Rem40X Polishing compound and it's ingredients and other cleaners' compounds. Good info in any case.
Works for me but YMMV ;-O
http s://forum.accurateshooter.com/threads/abrasive-bore-cleaner-specifications.3957645/
Works for me but YMMV ;-O
http s://forum.accurateshooter.com/threads/abrasive-bore-cleaner-specifications.3957645/