We recommend refreshing your wool duvet insert by periodically hanging it outdoors in the fresh sun.
Spot clean as needed. Treat stains by soaking area with hydrogen peroxide (note, this may cause lightening of fabric).
Can be machined washed in cold water on soak and spin cycles only. Do not use the wash cycle, which agitates and can ruin your comforter.
For stained items, add a dose of live cultured enzymes (such as Bac-Out by Biokleen) during soak.
Drape in the sun or warm place to dry. Do not wring or machine dry.