This is an experiment I decided to try. Take it however you wish.
I mixed First Choice with about an inch long strip of Iosso into a small bottle with a couple small ball bearings to help mix and break down the Iosso. The bottle is about 100ml.
This will be my new go to solvent for carbon and copper.
I looked at my barrel with the scope again today after shooting the Provincials this past weekend. No copper or carbon at all in the grooves or on the lands.
I just ran 2 wet patches of straight Boretech or First choice to get most of the carbon out. Wet a soft nylon brush with my solution and brushed back and forth maybe 14 to 16 times. Let sit while I loaded with brush at the end of the muzzle. Do about another dozen strokes after loading, 3 wet patches, dry, and oil.
The Thorro Clean and Flush works, but in the long run this is way easier on the pocket book when paying 30.00 US for a small cleaning solution kit.
Just an FYI. I dont expect you guys to change methods but no soaking needed at all.