lean Machine Milk Steamer Solution does a professional job of cleaning stubborn milk scum and build up from milk lines, valves and milk jugs. Carton Qty 12 Use: mix 50 ml of solution to1/2 litre of water Auto Frothers : run solution through frothing device and repeat with fresh water twice. Soak all milk lines and frothing components once a week for up to 30 minutes and rinse thoroughly afterwards. Steam Wands: steam solution in a milk jug as you would milk. Turn steam on & off over a one minute period allowing the solution to work its way up the steam arm. Repeat process twice with fresh water.