When washing wool, silk or any fine blend, you do need a detergent especially made for these fibers. A detergent where the active ingredients are an efficient blend of surfactants, not enzymes. Enzymes are particularly made to break down and dissolve dirt consisting of protein (organic stains, food, sweat, make up etc.). However, fabrics made of wool and silk fibers consist of protein only, and consequently, an enzyme-based detergent will destroy your garments after approximately two washes.