I am thinking that this should have been done before it got to you.
I am also assuming that you are buying your scrap from the guys that we sell it too. Most of us here sell it to those kind of guys who then get it to you.
That being said, in my opinion, I would be making sure that the middleman is bringing you clean material. If you start docking the middleman, he will then start getting tougher when the small guys bring it too him. Stuff rolls down hill.
That is the best I can do for you, sorry. Other than that, short of washing it, crushing and grinding it and then seperating with a magnet, I can not picture any other method.
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