2. Let the steam pipe just touch the surface of the milk. The tube is about one finger away from the inner wall of the milk cup. Turn on the steam switch and start to let the steam flow. If the test tube is too far away from the surface of milk, milk will be sprayed everywhere; On the contrary, if the tube is too deep under the surface of the milk, there will be no vortex in the milk cup, and the milk will only be heated without beautiful milk bubbles (excessive heating will also lose the milk flavor of the milk).
3. When the milk foam is almost full, turn off the steam first, and then take it away from the milk cup, otherwise it will easily cause hot milk to overflow, which is quite dangerous, so that the hot milk (or liquid) and milk foam that can be used are ready.