ok, so I have smelted my first 1000 pounds of range scrap. out of that it looks like i have 300 pounds of shredded copper jacket. I checked with the recycler yesterday and they will not take it if there is lead stuck to it. I thru 2- 5 gal. buckets into my cement mixer to tumble.............. 5 hours. now the jacket scrap looks like lead. can I clean this up enough to look like copper and if soo, what could i use?