I throw my duvet in the bath with w/machine soap powder. Jump about all over it they rinse it with the shower attachment. Shove it in a bin bag to take it outside and let it dry over the line.... beating it with a stick as it dries to unclog the feathers.
Smells really clean (fabric softner and fresh air).
Also relieves a lot of stress jumping all over it in the bath, might try grapes next and make wine, yum.
I think that sounds great - we could start Duvet Washing Parties and combine drinking wine with laundering our duvets. Stress relief and cleanliness - what a great combination !