There are tools for removing lots of lead. One is called a Lewis Lead Removal Brush. There are also reamers for various calibers, they're like drill bits without burrs. Finally if you have lots of elbow grease, just use a bronse brush repeatedly.
Lots of different chemicals make the claim that they remove lead. But I'd do as much as you can mechanically first.
Foul Out is a popular treatment system. can't think of any other off thetop of my head.
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