In ancient times (prior to the current safety culture) mercury was often used to get the lead out, and it does a fine job of that!
OF course, back in those days our science teacher in school would put some in the palm of our bare hand to chase around with a bare finger...
It's so bad, we're all dead now....but we aren't...yet..
Very toxic, not recommended, might even get you arrested or at least fined if you don't cross every 'i' and dot every "t" in compliance with hazmat regulations for use, storage and disposal, but it does get the lead out.
Use the Lewis tool. It works.