The short answer: how to wash a wool blanket starts with a question nobody asks first, which is whether yours is woven or knitted. Both need cool water, a wool-specific detergent and no tumble drying, because heat plus agitation felts wool permanently. But they dry in opposite ways: a woven blanket like a Pendleton can hang over a line, while a knitted or chunky yarn blanket will stretch and grow under its own wet weight and must dry flat. Get that one thing wrong and you end up with a blanket a size larger than the one you washed. And before any of this, consider whether it needs washing at all, since wool is naturally odour resistant and airing it outdoors solves most of what people reach for the machine to fix.
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