You really shouldn't take a tie in for dry cleaning unless you really have to. It tends to destroy the natural luster of the silk. Of course, if it's filthy, or you got a giant chocolate ice cream stain on a white tie... well, you can either clean it or trash it. The best way to go with ties is to roll them up around your hand, and then stand the roll on its end in a drawer. It only takes a couple hours to get the wrinkles out. Silk is extremly springy and resilient if you let it return to its natural state on its own. In fact, it was used in the early days of ballistic armor before nylon and kevlar were around.