Thanks Jackcrafty, I actually did see your post on that thread just after I started this. I tried the soap and water and it worked well. I soaked the feathers a couple of hours in hot soapy water then rinsed and laid them all out on a drop cloth on the porch. Laid another drop cloth on top and let them dry overnight and next day. I may have to steam a few before cutting them to shape.
I have more feathers than I thought, about 75. Only 2 turned out to be junk. I should be able to use most of the others.