I dunno, but I recently had my down sleeping bag and gore tex rain jacket professionly dry cleaned (sleeping bag cost $25 and the jacket cost $13) and that did the trick. The sleeping bag had never been cleaned its 10 year life, it smelt soooo good afterwards. I assume that a down jacket wouldn't cost that much. Take it to a dry cleaner, see what they say. there's a Taylors dry cleaner opposite Moore Wilsons on Taranaki St
Sammy Roo