Cleaning your goose down duvets needs to be done with care or you’ll ruin its insulating properties, but this is especially true for down duvets. The first and best answer would be to take your down duvet to a professional dry cleaner who has experience with washing down duvets and jackets. You can be sure it will be done correctly, although it will cost more money than doing it yourself. If you want to wash your goose down duvets at home then you’ll need to be sure that you don’t have a washer with a center “spindle”. Basically it’s the washer that contains a column in the center which is used to move the clothing around as the wash cycle proceeds. Many modern washers no longer have this and are front load washers; these are good for cleaning down vests because they don’t shift the vest in a way that could tear up the feathers. You want to place the washer on the most gentle cycle, use cold water, and down detergent.
Once this is completed remove the duvet from the washer and squeeze any excess water from. After excess water is removed you will need to fluff the down with your hands. Basically you’re going to be grabbing the duvet at different areas and picking up the down with a fluffing motion. This gets the feathers unstuck from one another and will help with the drying processes.
Once you’ve fluffed the duvet for about two minutes place it in the dryer on a low heat cycle for about twenty minutes (times will vary with different dryers and different size down vests). After the cycle is complete remove the duvet and fluff the goose feathers again for about two minutes. When completed hang the duvet upside down to let the down be pushed more to the top. Once you start wearing the vest again the down will make its way toward the bottom again.