If you want to wash the crochet blanket by hand, simply fill a sink with enough water to submerge the blanket. The yarn should have a label with washing instructions, or it can specify the fiber type so you can see in step two whether you should wash the crochet blanket by hand or in the machine. If it’s acrylic, or synthetics, or cotton, you can wash it with your laundry. However, wool yarns and older cotton yarns should only be washed by hand. For example, you just learned how to wash a crochet blanket safely by knowing the proper care instructions based on the material used.