McKees's 37 SiO2 Auto Wash is formulated for the unique cleaning requirements of vehicles that are coated with a paint, wheel, or glass coating. A thick foam makes an abundant amount of suds that encapsulate dirt and grit. This pH balanced, non alkaline auto wash that contains water softeners can be used in direct sun. The water softener's job is to reduce water spotting. It can also be used on non coated vehicles as a gloss enhancing auto wash. The entire vehicle can be washed with the Sio2 Auto Wash and then do your last and final rinse. This wash is very concentrated. Using just an ounce or two makes plenty of suds.