WipeOut and Outers foaming bore cleaners are those that I use for copper, WipeOut specifically states it won't remove lead, but it does attack the alloys in the lead and makes the remaining lead come right out. WipeOut is harder to find, but Outers is sold at Walmart. I haven't used the Outers for lead fouling, though....but FWIW, I think they are the same stuff, they smell the same to me, what little odor there is anyway...Don't get either of em on varnish/oil type finishes, they'll remove it, they don't affect modern polymer finishes, though.
Tim