- Visit our website for more great instructional videos: https://dupray.com/blog/videos/ . Don't forget to check out the rest of our "How To" videos: http://tinyurl.com/qcqsbpa . Instructional video on how to steam clean the outside of your car rapidly and efficiently using the Dupray Carmen steam cleaner. First, spray a rinse free chemical and use the hose with the highest setting. Smoothly pass over the surface of the car and wash off the residues with the cloth. Dry steam will deliver incredible results on your car and is completely safe.