As mentioned on another thread, I washed my Western Mountaineering sleeping bag following the directions and products (ReviveX) stated on the Western Mountaineering website. It took quite a while, but the result was worth it. The bag fluffed up thicker than it was when I bought it, so it was actually a bit warmer!
Here is the information.
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May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey