Made in Germany and factory improved by leading German automakers, its formula will not harm the delicate finish on your factory wheels. in 1976 by a German chemist, p21s is a water based, non acid, that provides terrific cleaning and guarantees not to damage any of wheel: painted, clear-coated, polished or anodized. Start with the 500 ml spray bottle and then reorder the 1000 ml refills.