In reply to jethro kiernan:
If doing yourself then I would run the washing machine through on a number of cycles with just liquid soap or Techwash and clean out the trays. Also worth running it at 90C if you can with old tea towels and clothes.
Then use down wash jacket.
But does the jacket have any form of DWR layer or "proofing"
When tumble trying must has a warm rather than hot setting and tennis ball to break up clumps.
Loads of advice if you google