Wipe out is the schit for copper. Kroil otherwise....
+1, except to add that Barnes CR-10, Montana Extreme, or Sweets 7.62 all seem equally effective at copper removal. NOTHING beats Kroils for lead removal, powder fouling cleanup, or general gun lubricant and preservative. It is definitely worth the $13 or $16/ can. When you aren't cleaning guns, Kroil will work miracles around the garage as well.
