
"To "sanataise" feathers there are several methods. If its dirty, use soap and water and blow dry and preen them so they dont dry all stuck together. (Water doesn't hurt them- birds have to take baths after all. Boiling them may hurt them but regular cool or warm water wont.) If you just want to make sure there are no buggies/mites/etc you cant see on them (its possible specially with wild birds and mites will eat the feather over time and ruin it) then put them in a plastic bag and shove them in the freezer for a day or two. Freezing kills off most most thing, specially mites. If your still worried, pet stores also offer a mite spray for birds you can spritz them with. "
Mike