Prepare a basin of warm water, thoroughly soak the down jacket, add detergent, and soak for 10 minutes. Choose a neutral detergent or a down jacket-specific detergent.
When washing, use a small, soft-bristled brush to gently clean heavily soiled areas of the fabric (do not brush coated fabrics, as this may damage the coating).
After washing, gently squeeze out the excess water from the down jacket and hang it in a well-ventilated area to air dry, avoiding direct sunlight.
During the drying process, gently pull apart any clumps of down to loosen them and ensure thorough drying, preventing mold growth from prolonged dampness. Once completely dry, gently pat the down jacket to restore its fluffiness.