I have a down jacket that's become a little aromatic. Not full on 1970s Snell's Field, but noticeable.
All the instructions I've found online suggest tumble drying with tennis balls to dry and de-clump the down, but I don't have access to a tumble dryer. Anybody have experience of doing this successfully? I assume I'm going to need to massage down clumps by hand to break them up, direct sunlight bad, etc.