1) Place a container under the steam wand.
Use a container of at least 1 litre capacity. If you do not have a container of this capacity, once it is filled, close the knob, empty the container and then place it under the wand again and repeat the procedure.
2) Only after adding the descaling solution into the tank, turn the knob clockwise to the STEAM/HOT WATER position and dispense 2-3 cups of water (approx. 150 ml). Stop dispensing by turning the knob back to its central DOT position.
3) Let the descaling solution take effect for 10 minutes. Repeat steps 2 and 3 at intervals of 3 minutes until there is no descaling solution left in the water tank.