This video tutorial is in the Food category which will show you how to clean a Coffee Machine Milk Frother on Katarina. Take a jug with about 400 ml of water and pour about 50 ml of the cleaning liquid in it. Mix it and put the frother pipe in the jug and turn on the frother as if you were frothing milk. Run the entire mixture through the frother and thereafter run some clear water through the frother to remove the remnants of the cleaning agent from inside the frother. Repeat this process after you make about 20 - 30 cups of coffee. You can also run clear water through the frother at shorter intervals.