I'm sure I'm not the first to wonder this but I read a lot of people talking about what a PITA it is to clean wheel weights and let them dry before you melt them. I just lucked into my first batch of wheel weights and yup, they are definately dirty. What would happen if you took your tumbler out to the back yard, to keep any lead powder, etc. from collecting in the garage and ran them through the tumbler with the crushed shell lizard litter? Would it somehow remove some of the lead from the weights and make it not worth doing? Any thoughts?