To wash feathers, use normal dawn (not antibacterial), rinse extremely well, and then blow-dry. If the feathers are loose (not attached to a skin) I will stick the base of each to a piece of tape to blow dry them. Blow drying fluffs them back up in a way that air drying does not.
I actually paint on feathers. Here is one on a chicken wing feather!
I actually paint on feathers. Here is one on a chicken wing feather!