I received my spokes back from cadmium plating. I spent over 2 hours standing in front of my wire wheel cleaning them up and then scrubbed them in hot water. The plating company runs them through a Wheelabrator before plating.
When I sent them off for plating I was very amazed at their condition. There wasn't a bad spoke or nipple in the bunch. Not bad for 65 year old original spokes!
I must say I lucked out on the condition of a number of things about this bike so far; tins, frame, engine, wheels. I think it was a cut above your average box case job.