I use this cleaner to clean my private Vibiemme from coffee fat. The cleaner renigt hervoragend, the material is after several Reinigungsgdurchgägnen not attacked or become blind, so go ichdavon from the both stainless steel so make · brass, aluminum, copper, with these cleaners no problems. The portafilter briefly soaked so shine also equal wieer like new. Ausspühlen but NEVER FORGET !!!