How to clean Peacock Feathers?
You could try putting them in the freezer for a couple of days. Then place in a knee high stocking and vacuum well. You could also fill up the sink with water and dish soap. Sprinkle the feathers on top then gently dunk the feathers with your hands. Then let them soak for about half an hour. Drain the sink, refill w/ fresh water, and repeat dunking & soaking. Remove feathers, and if necessary, reshape. Lay them out on a towel until dry.