The best cleaner is time.
1. Pick a solvent that does not warn against soaking.
2. Brush and patch a few times to get out the loose fouling.
3. Leave the barrel wet with solvent overnight. A chamber plug to let you fill it up is even better.
4. Wipe out and reapply, soak again.
5. Repeat until the barrel is clean or you are tired of fooling with it.
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