To clean a down comforter, you can follow these steps:
1. Check the care label on the comforter for specific cleaning instructions.
2. If the comforter is machine washable, use a large front-loading washing machine on a gentle cycle with cold water.
3. Use a mild detergent specifically designed for down-filled items.
4. After washing, rinse the comforter thoroughly to remove all detergent residue.
5. To dry the comforter, place it in a large dryer on low heat with a few clean tennis balls to help fluff up the down.
6. It may take several cycles to fully dry the comforter, so be patient.
7. Alternatively, you can hang the comforter outside to air dry, but make sure it is completely dry before storing it.
Remember to always follow the care instructions provided by the manufacturer to ensure the longevity of your down comforter.