Ewww, Gym Etiquette

Yesterday as I was enjoying my treadmill run I noticed the guy running next to me get off the treadmill without wiping it down. It was sweaty and gross. I know he had to have seen it because the display was dirty and he had to push buttons on it to slow down/stop the machine. I now know who the person is when I see the display all dirty. I've taken to wiping down the machine before AND after I use it. Come on people! Follow gym etiquette, clean up after yourself.