Non-washable Part: main pump unit The main pump unit of a breast pump is an important, non-washable component. It is responsible for drawing milk from the breasts and transferring it into the milk bottle. It is essential to keep this unit clean and dry to ensure its proper functioning and longevity. A clean, damp cloth can be used to clean the main pump unit, ensuring that the area remains dry and free of residue. Any other cleaning method may be considered misuse under the warranty. Washable Parts: Breast Shield, Milk Bottle, Tee Joint Connector, Silicone Gas Storage, Duckbill Silicone Valve Regular cleaning of the washable components that come into contact