If your silk duvet cover or duvet set is a lighter shade of silk, you should have no problems washing it with water and a mild detergent.
Before water washing silk, perform a color fastness test by dipping a portion of the silk into tepid water. Take a piece of white cotton fabric and firmly press it on top of the wetted silk. If there is only the slightest trace of color transfer, or none at all, then it is safe to wash the silk duvet with water.
If you decide to wash your silk duvet set with water, be sure to use cool or tepid water only. Water that is too hot will most likely cause the silk to blotch as it dries.
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