Yep..Dawn works the best.
I dry them on low with a hair dryer to help get the hair straight if bent. A fine comb helps.
If they are really bent up, try putting them over a steam pot and the steam will work miracles! Use pliers or forceps so you don't burn your fingers and do it a little at a time until you figure out how far from the steam works best.
Works even better on feathers!