Here are the steps on how to wash a sleeping bag: 1. Check the cleaning instructions on your sleeping bag's care label. You must be careful in determining the correct method of cleaning your sleeping bag. For example, your sleeping bag may be cleaned by hand, machine, or dry cleaning. Some sleeping bags can be machine washed, 2. If your washing machine may clean your sleeping bag safely, use a heavy commercial washing machine and a mild detergent. You should also use cool water and select the gentle cycle option. 3. If it's recommended to clean your sleeping bag through handwashing, you can fill a bathtub with cold water and mild detergent. After washing, you can gently agitate the sleeping bag and rinse it with cool water. 4. You should squeeze out as much water as possible without twisting or wringing your sleeping bag. 5. You can tumble dry on low heat and add clean tennis balls or dry towels to help fluff the insulation. 6. You should check your sleeping bag periodically to ensure that it is drying evenly and is not damaged by heat. 7. Once dry, you should store the sleeping bag in a cool, dry place, and make sure it is completely fluffed before packing it away.