Baby & Kids Gear

How to Clean and Sterilize Willow Go Pump Parts

Willow Go has five washable pieces around an electronic pump body, and the two groups must be separated before they reach the sink. Willow instructs owners to clean the milk-contacting parts and diaphragm in hot soapy water and boil them for five minutes before first use, while the powered pump itself is wiped rather than submerged. After pumping, complete disassembly matters because milk film can hide beneath the diaphragm and around valve openings; completely dry reassembly matters because trapped water can affect seal and suction. This guide is specifically for Willow Go, not the original Willow 3.0, Willow Wave or Willow Sync, whose containers, flextubes or cleaning sequences differ. Follow the current size insert and accessory instructions separately.

Published · Updated

Primary reference: Willow official Willow Go cleaning instructions. Always check the manual for your exact model.

Quick reference

Washable set
Fully disassemble all five milk-contact parts and diaphragm.
First use
Hot soapy wash, then boil approved parts for five minutes.
Pump body
Clean towel or lightly damp cloth only; keep it dry.
Avoid
Motor immersion, partial disassembly, valve probing and damp reassembly.
Ready when
Every part is dry, seals lie flat and suction is stable without leaks.

What you will need

  • The current Willow Go user guide
  • Clean hands
  • A dedicated wash basin
  • Hot water and mild dishwashing soap
  • A soft dedicated bottle brush
  • A pot, clean tongs and timer for first-use boiling
  • A clean drying rack or unused towel
  • A soft damp cloth for the powered pump exterior

Step-by-step instructions

Step 1: Turn off and separate the powered pump

End the session, turn off Willow Go, remove it from the breast and wash hands. Disassemble the container, flange, diaphragm and the other washable milk-contact pieces exactly as the app or user guide shows. Put the powered pump and charger in a dry area; neither belongs in the basin.

Step 2: Inspect all five washable parts

Separate every seal rather than washing a partly assembled cup. Check the diaphragm, duckbill-style valve areas, flange tunnel and container edges for milk film, tears or distortion. Do not poke a narrow opening with a sharp brush or pull flexible material forcefully, because a small defect can create an air leak.

Step 3: Clean before the very first use

Willow says to wash the five washable parts—the milk-contacting pieces and diaphragm—in hot soapy water, then boil them for five minutes before first use. Keep pieces separated and give them space in the pot. Remove with clean tongs and place them on a clean drying surface.

Step 4: Wash promptly after pumping

Rinse or wash the fully disassembled washable parts after every pumping session according to Willow's current guidance. Use hot water, mild dish soap and a dedicated basin. Agitate flexible parts gently and brush broad container and flange surfaces without forcing bristles into valve openings.

Step 5: Rinse away all soap

Rinse each piece under clean running water, moving it so hidden edges and the underside of the diaphragm clear. Soap film can create odor, contact residue or sealing problems. Do not use a used kitchen sponge or place clean parts back in a sink where food bacteria and cleaner remain.

Step 6: Wipe the pump body only

Use a clean towel or lightly damp cloth on the powered pump exterior. Keep liquid out of seams, buttons, charging contacts and the motor opening, and never run the pump under a faucet. Remove visible milk promptly without spraying disinfectant directly on electronics.

Step 7: Air-dry parts completely

Place pieces separately on a clean rack or unused towel and allow complete air drying. Avoid rubbing milk-contact interiors with a used cloth or reassembling while droplets remain beneath the diaphragm. Dry storage also prevents odor and makes it easier to see residue before the next session.

Step 8: Reassemble and check suction

Fit each dry part in the order shown by Willow, ensuring the diaphragm edge and valve surfaces lie flat and the container locks to the pump. Start a session and listen for a stable seal. If suction is poor, recheck clean dry assembly and inspect for worn parts instead of increasing suction against a leak.

Specific cleaning questions

Open a question for a concise answer about stains, odors, safety, frequency, and troubleshooting.

Which Willow Go parts are washable?
The five removable milk-contacting parts, including the diaphragm, are washable. The electronic pump body and charger must stay out of water.
Do Willow Go parts need boiling before first use?
Yes. Willow instructs owners to clean the washable parts in hot soapy water, then boil them for five minutes before first use.
How often should Willow Go parts be washed?
Fully disassemble and clean milk-contact parts after each pumping session, following the current Willow instructions.
Can the Willow Go pump motor get wet?
No. Wipe the powered pump with a clean towel or lightly damp cloth and keep liquid out of openings and contacts.
Can I wash the pump while it is assembled?
No. Separate all washable pieces so milk beneath seals and the diaphragm is actually removed.
Why is Willow Go suction low after washing?
A damp, folded, damaged or misseated diaphragm or valve surface can leak. Reassemble completely dry intact parts before changing settings.
Can I dry parts with a dish towel?
Air-drying on a clean rack or unused towel avoids transferring lint and kitchen residue to milk-contact surfaces.
When should a Willow Go part be replaced?
Replace a piece that is cracked, torn, warped or no longer seals, and stop using damaged parts according to Willow's support guidance.