1. Air drying. In clear weather, flatten the cotton down quilt and use a clothes hanger to help remove moisture and maintain its fluffiness. When drying, a thin layer of cotton cloth can be covered on the down jacket to protect its surface from direct sunlight. The drying time is generally from 10am to 3pm, avoiding prolonged exposure to sunlight. After drying, gently pat the down comforter to restore its fluffy and soft texture.