Can you put feather duvets in the dryer?

Yes. Warm water. Dry until COMPLETELY dry. If really large, use the front loaders at the laundromat. Put a couple of tennis balls or clean sneakers in the dryer to break up the clumps.

*Some* dry cleaners will take feather-filled bedding *if* it is completely enclosed in a case (many feather ticks come with a large zipper covering that can be removed).