How to clean the silk duvets
First, do not wash them with soak.
Second, do not dry them in washing machine.
If you accidently spill some coca cola onto the silk duvet cover, just put some white vinegar on it and gently rub it after 5-10 minutes, then, dry it in the air.
Plus, silk duvet can not be exposed to the sunshine for a long time because the protein fiber in the silk would become weak and yellow if there are too much ultraviolet light. You just put it in some dry and cool place.