Here is a good site with info on building and or rebuilding, it says you can dunk it in dawn.
"After the cleaning is complete, you have the option of washing the fan if the feathers got dirty or were messed up on the tips. If you've ever shot a bird that rolled down a mountain or shot one in the rain you know that often the tail feathers are a ragged mess when you get to the bird. They can be fixed, as long as they aren't broken, by simply washing them. Start by dunking the cape, tail feathers and all, into a tub or sink of warm water that has Dawn or some other mild grease-cutter/cleanser mixed in with it. "
United States Air Force
A Veteran: Someone who, at one point in their life, wrote a blank check made payable to "The United States of America," for an amount of "up to and including my life."