Neesie

I've used regular liquid laundry detergent. We no longer have down pillows but I still wash down jackets and coats, the same way.

Chester the bunny

In between washings if you have concerns about dust mites, this is what I read online
"Freezing and sunlight kills mites but does not remove their residue. In addition to freezing temperatures and washing items in temperatures greater than 130 degrees F, extended exposure to sunlight, and low levels of humidity also destroy the mites. "

patski

I wash my pillows at home, just add a coupe of tennis balls in they dryer with pillows and they will fluff up and be like new