What should I do if the quilt is very big and musty?

If the quilt has a strong musty smell, it will affect your health. The best way to get mold on a quilt is to expose it to the sun. On a sunny day, drying a moldy quilt and tapping it with a stick can remove dust and dead mite carcasses from the quilt. If there are moldy black spots on the quilt, it must be taken apart and washed.