I looked back at our discussion a few weeks ago about removing the lead from
spark plugs and I couldn’t find a mention of Vinegar and Peroxide.  I talked
to a friend of mine today who is quite knowledgeable about guns. When I
asked if he knew of anything that would remove lead he immediately said “oh
sure, 50% vinegar and 50% regular store brand Hydrogen Peroxide” (i.e. 3%
solution). He said he’s used it numerous times and it works great. Hope that helps.

Joe Hull
Cozy Mk-IV #991 (Done Building! In Phase1 Flight Test - 0 hrs flown) Redmond (Seattle), Washington