For a certain sort of person, nothing is better than sweaters: Fair Isle cardigans, sleek merino wool crew necks, ivory cashmere, chunky cable-knits. But for a certain sort of that sort of person, nothing is worse than washing them. Sweater-lovers must contend with pilling, shrinking, complex care tags, dry cleaning bills and, most daunting, the prospect of hand-washing. Experts say many people are wary of cleaning sweaters, but they needn’t be.