Puro Espresso Machine Cleaner is specifically designed for cleaning and maintaining espresso machines. It removes the buildup of oily coffee residue from the screens, valves, and tubes of brewing groups. If allowed to develop, this buildup will make your coffee taste rancid, and eventually lead to machine malfunctions. For the professional barista, the conditions caused by dirty machines are not only aggravating, but bad for business. To avoid these problems, backflush your machine with Puro Espresso Machine Cleaner every day according to its instructions.