Black Diamond Auto Wash Car Wash Black Diamond Auto Wash Visit Website 15850 West Colfax Avenue Golden, CO 80401 (303) 999-0431 About Map About Express Car Wash. Our spacious, open, bright and state of the art cash wash offers cutting edge technology, environmentally-friendly features to proudly serve our Colorado community. We offer state of the art walk up Dog Wash and detailing onsite. What's Nearby? Distance: 5 10 15 20 25 50 mi.