it out. In out—in fact, it prolongs the life of your jacket. Washing and drying your down jacket is easy, easy; it just takes a few simple tricks to keep the down nice and fluffy. Follow these steps for a warm, clean jacket on your next adventure. [ … ] you find use a down wash that's low in chemicals and as environmentally friendly as possible, such as Granger's, linked Granger's (linked in the tools section below. below).