Milk System Cleaner, 2x1L, Coffee Format MILK FORMAT YELLOW PROMilk Frothing System Cleaner, 2 L MILK FROTHING SYSTEM CLEANER COFFEE FORMAT MILK FORMAT YELLOW PRO is a professional alkaline cleaner designed to maintain and protect milk frothing systems in coffee machines. The cleaner has been formulated to effectively remove fatty and protein based milk residues from milk lines and the frothing system. MILK FORMAT YELLOW PRO comes in a convenient 1 liter bottle with an integrated dispenser, which makes it easy to