Most animal-based fibers, like the ones we reviewed above, are hand wash only to avoid shrinking and preserve their look. All you need are a few materials and either a gentle detergent or a wool wash.  Fill a large sink, bathtub, or bucket with cold water and then, according to the detergent or wool wash’s instructions, add in the correct amount of cleaner and swirl to evenly disperse. If you haven’t already, spot treat any stains that need attention, and then submerge the item into the water and take care not to twist, wring, or scrub it; otherwise, it will lose its shape or become damaged.  Gently rub the item between your hands and once it’s clean, rinse it well until the water runs clear. Squeeze the item dry without wringing too much and lay flat on a dry towel. Press down firmly as you roll it up into the towel. Place the item face down on another dry towel and reshape it but avoid tugging or pulling it too much. Let dry for 12-24 hours, turning the item over if you need to.