Buyers want steel and Al removed to save time and labor on their end to prep boards before sending to a refinery. Most shouldnt mind the small copper bearing parts since they should be getting paid for copper content as well as precious metals. I have never heard of a refinery paying out for Al but I could be wrong.
Also remember that steel adds weight to there loads. The refineries charge a per pound fee to refine, so the less steel the better.
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