How to sanitize your silk pillow & silk comforter
You are not supposed to wash your silk pillow & silk comforter simply because of the water will be absorbed into the pillow and comforter, the weight of the water will make silk floss uneven and caused lots of knots.
But there is certainly a way to refresh your pillow and comforter. You can put the pillow into the dryer with low heat setting and run a short program for 10 minutes or so to refresh your pillow.
For silk comforter, you can air it out once or twice a year to refresh it.