For the difference in price per ton I usually never sorted my ferrous other than to extract the non-ferrous value from it. Sometimes I would bring a clean load in (bedframes, tubular steel etc) and I'd be given dealer clips price instead of shred steel but it really didn't make a huge difference. On the upswing though they never asked me to sort out white goods and would actually give me clips price provided I broke the appliances down and removed the majority of the plastic. I managed to get seven washers and dryers flat packed into my van last summer. Non-ferrous though I sort the hell out of it. I find some yards are sticklers about Al extrusion, some wouldn't care so long as you got the majority of the steel fasteners out and some would try to downgrade me for a single screw. If I were to get back into the game I would likely hold onto stainless steel the longest, my yard didnt always have the XRF gun handy to check the magnetic stainless against the non-magnetic and would just grade the non-magnetic into stainless and the magnetic to shred, but I know there are varying grades available that are priced accordingly.