satin black is a pain in the a-hole dude, as you have found it marks easily, wash with a ph neutral shampoo as normal but make sure as soon as you have rinsed it off you get it dryed asap to avoid water marks, the only wax (that i know of anyway) you can use on matte/satin black is swissvax opaique. but all that said it will still mark if you touch it unfortunatly.