Cleaning parts:Β You have to clean all parts except the motor unit. Note that dust, milk or water does not enter into the motor, it will damage the motor.
You can clean the pump in any of the following ways:
Washing the accessories in pool of water: You can wash all other parts in lukewarm water in small pool of water. Avoid boiling the parts to lengthen their life. Boiling can change the shape of the silicone part which and will also reduce the life of the spare parts made of silicone material so do not clean them in hot/boiling water.
Sterilizer:Β You can alternatively sterilize the parts in sterilizer. But do not put the valve, diaphragm, flange and breast shield at the bottom of sterilizer.