Well first What are they coated with. Powder paint , vynil , ect. it would be best if the coating is removed from the head first . Then pick up a pair of flush cut jewlers/craft pliers . They cost between 5 and 8 dollars at any craft section in almost any store . Cut the lead head off following generally the middle of the head down the shank toward the eye. This saves having the hook go through more heat than necessary. After you have accumilated the lead melt it down in a container other than your lead pot. Once you have the lead about as hot as you can possibly get it stir it with a kiln dried oak dowel rod ,as you do skim off the dross that will accumilate on top of the lead. do this until you get nothing but the soot from the dowel floating on the lead. Your lead is clean and ready for you to repour the hooks. I've only done this about a thousand times.