Fortunately, a bathtub and some gentle hand washing is all you gotta keep your bag performing efficiently.
Sleeping bags are more delicate than they look.
Plus, they can pick up odors that no amount of FeBreze is going to help.
And while a front washer is gentler, many sleeping bags are just too bulky for them to handle.
As Instructables userBoddeeenpoints out, that and some mild detergent is all you need.
Fill your bathtub about halfway with warm water and add a small amount of gentle, powdered detergent.
Hit up the post for full instructions and pictures.
How to Wash a Sleeping Bag| Instructables