We’ve talked about how to revive the Durable Water Repellant treatment on your clothing but readers have asked us about down. We found this article to help you out. 
Visit the link for the full story.
http://www.outdoorresearch.com/blog/stories/how-to-wash-your-down-jacket
Tags: Outdoor Research
Even though that Nikwax might be better for down I use “Sportswash” for all functional clothing. Their products are more focused on tactical/hunting users.
I also have a dedicated machine so there is no risk of getting brighteners in the clothing.
These articles are really great – anything on soft shells?
Use Rockin Green soap for fleece and softshells and down and pretty much everything else. It’s clean-rinsing and doesn’t use optical brighteners – and they offer a military discount.
http://rockingreensoap.com/