realsimple.com wrote:

In most cases, it’s safe to hand wash wool (including blends), but let the care label be your guide. Add 2 squirts of a delicates wash, like Wool & Cashmere Shampoo ($19 for 16 ounces, thelaundress.com), to a sinkful of tepid water. Turn the garment inside out; submerge, swish, then soak for 10 minutes. Rinse twice, pressing out the water. Never wring or hang-dry, since wet wool stretches easily.