How do you clean a down sleeping bag effectively?

To clean a down sleeping bag effectively, follow these steps:

1. Use a front-loading washing machine on a gentle cycle with a mild detergent specifically designed for down products.
2. Rinse the sleeping bag thoroughly to remove all soap residue.
3. Dry the sleeping bag in a large dryer on low heat with a few clean tennis balls to help fluff up the down.
4. Make sure the sleeping bag is completely dry before storing it to prevent mold and mildew growth.