If there’s a better way to self-soothe during the gray, rainy transition to fall than cashmere, we haven’t worn it. Made from the soft undercoat of certain breeds of goats, cashmere is among the softest things you can put next to your skin, but beyond its buttery softness, it has a reputation for being tricky to keep clean. Cashmere is also, obviously, expensive—at least compared to regular wool or merino—and if you’re treating yourself to a cashmere sweater as an investment piece (which you absolutely should), you’ll want to learn how to avoid shrinking it in the wash. The good news? Cleaning your treasured new V-neck isn’t as complicated as its reputation suggests. “When washed correctly, it should stay soft and feel refreshed,” says Zachary Pozniak, COO of Jeeves New York, a luxury laundry service. The problems start, he says, when you rely on heat, friction, or harsh detergents, all of which can lead to “shrinkage, felting, stiffness, pilling or loss of shape.” In other words, it’s OK to wash cashmere at home, but you …