The right method to treat this common household fabric.
Hand-wash silk knits with a mild detergent, such as Woolite, and lay flat to dry. Then put the item in the dryer on the air-fluff setting for two minutes to restore the fabric. Dry-clean all other types of silk, such as tussah. (Most silk fibers will bunch together when washed.)
Care tip: Ask your dry cleaner to use a shorter, more delicate cycle when cleaning silk. (A standard bulk cycle may ruin the fabric.)