Can you hand wash merino wool sweaters? Yes! Can you wash cashmere sweaters? Definitely! Can you wash a dry clean only sweater? I will show you how. I will show you how to wash wool sweaters by hand. In this hand washing how to you'll be guided through how to hand wash wool, cashmere, and wool blend sweaters. This tutorial on hand washing sweaters will show you best practices on hand washing wool, tricks for repairing holes in sweaters, and the cost benefits of hand washing sweaters.