Swirl the wig in a basin with some shampoo- that will help to take off the silicone that is on the synthetic hair. Towel dry, and then hang it to dry or lay it on a towel. Once it is dry, put some baby powder on your hands, and run your hands over the wig. Repeat as necessary until you have noticed that it does not look so shiny. The goal is not to make the hair look grey, but just enough powder to reduce the shine. This really helps to cut down the shine on synthetic hair.