http://www.westernmountaineering.com/index.cfm?section=Product%20Tips%20and%20Care
"At some point you'll need to clean your bag. Don't let this frighten you! The best way is to hand wash it in a bath tub or you can use a front loading washing machine. Never use a top loading or agitator machine as this can damage the baffle construction. Only use a soap especially prepared for down products. Dry cleaning is not recommended since the solvents can strip away natural oils contained in the down.
When you hand wash, fill the tub with warm water, add down soap and put the bag in the tub. A tip here is to keep your bag in its stuff sack and put the whole thing underwater. That way air has already been forced out of the bag and you won't have to fight air filled baffles floating to the surface."
我也是用這個方法手洗唷,我覺得髒了就要洗...我用純肥皂洗,陰乾,電風扇,吹風機低溫吹,除濕機,到最後羽絨衣睡袋都變膨了耶~