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Mountaineering Designs were recommended on here (somewhere), and by someone else I know. The process was a little old school - the online web form, sending it off, not really hearing a lot back...but I used them after my bag stank after a long tour. Came back smelling great and no worse for wear. It wasn't cheap but I had the confidence that my bag wouldn't come back ruined.
I think you can do it yourself but the process seems quite convoluted and for whatever reason, at the time, I didn't feel up to it.
If it's not so bad maybe just leave it outside to air for a day or so.
Anyone have any good tips for washing a down bag? A few overly hot summer nights have left it less than welcoming...