I pull all transformers and unwind them to get clean #2. It is theraputic to crush them with vice grips and grab the wire out any way I can.. Gives me a repetitive short term goal that keeps me from stressing about other things. Really thin stuff I leave in the transformers and sell as copper bearing. Heat sinks come off and get sorted into aluminum, steel and copper. The boards themselves I save in a big box to be dealt with later.. If I can't find anything else to do with them, I sell em at the yard as copper bearing.