How to Clean and Sanitize Your Wearable Breast Pump Parts Without a Sterilizer

Quick Answer

You can safely sanitize your wearable breast pump parts without a sterilizer by washing them with warm soapy water, rinsing thoroughly, and then boiling them in a pot of water for 5 minutes. Allow parts to air-dry completely on a clean towel before reassembling.

Cleaning your wearable breast pump parts doesn't have to mean buying a separate sterilizer. A simple sink wash plus a quick boil works for most moms and keeps milk safe for your baby.

Whether you use a Willow Go or a manual pump like the Willow Wave, the same basic hygiene rules apply: wash soon after pumping, sanitize regularly, and let everything dry fully before the next use.

Why Cleaning Without a Sterilizer Is Fine

For healthy, full-term babies, the CDC and most pediatricians say that washing pump parts with hot, soapy water after each use is enough. A sterilizer adds extra peace of mind, but it's not a daily requirement unless your baby is premature or has a medical condition.

If you do want to sanitize, boiling is a proven, low-cost alternative. Just place the parts in a pot of water, boil for five minutes, and let them air-dry. No expensive gadget needed.

• Check your pump manual for any parts that should not be boiled, like electronic components or certain plastics.
• Always disassemble completely before washing and sanitizing.

Step-by-Step Washing Routine

Start by rinsing each part under cool or lukewarm water to remove milk residue immediately after pumping. Then wash with warm water and a mild dish soap, using a dedicated bottle brush to reach flanges, valves, and containers.

Rinse every piece thoroughly under running water to remove all soap, because leftover soap residue can irritate your baby and affect the taste of the milk. Then place the parts on a clean, unused dish towel or a dedicated drying rack.

Let everything air-dry completely before reassembly. Moisture trapped in valves or flanges can lead to mold or bacteria growth, which is a common mistake many moms make.

• Avoid antibacterial soaps and those with strong fragrances—they can leave a residue.
• If you use a dishwasher, place small parts in a mesh bag on the top rack. But hand washing is usually gentler and recommended for most wearable pump parts.

How to Sanitize by Boiling

Fill a large pot with enough water to fully submerge all parts. Bring it to a rolling boil, then carefully add the parts. Boil for five minutes—set a timer—and use tongs to remove them. Let them cool completely on a clean towel.

Boiling is a reliable method for silicone and most plastic parts, but never boil electronic components, batteries, or the main motor unit of an electric pump.

If your pump has parts that shouldn't be boiled, check the manual for an alternative, like a cold-water sterilizing solution or a steam bag made for pump parts.

• Boiling can cause silicone to become sticky or degrade over time, so replace parts as needed if you notice changes.
• You don't need to boil every day—once a day or even a few times a week is usually enough for a healthy baby.

Drying: The Step Most Moms Skip

Air-drying is the safest and most effective way to dry pump parts because it prevents bacteria from growing in trapped moisture. Place everything on a clean towel or a dedicated drying rack with good airflow.

Avoid using a kitchen towel to pat parts dry—it can transfer bacteria. And if you're in a hurry, resist the urge to reassemble while damp; moisture compromises the seal and can cause suction issues.

Some moms use a clean paper towel to gently blot stubborn droplets, but air-drying is still the gold standard.

• If you're short on time, have two sets of parts so one can dry while you use the other.

When to Replace Parts

Even with perfect cleaning, pump parts wear out. Silicone valves and membranes can stretch or lose their shape, and flanges can develop tiny cracks that are hard to see but harbor bacteria.

The Willow Sync Backup Parts Set is designed to help you keep a fresh set on hand. Replacing your parts every 90 days—or sooner if you notice discomfort or wear—keeps pumping efficient and hygienic.

Common signs you need new parts: suction feels weaker, milk flow slows, or parts look cloudy, sticky, or misshapen.

• Keep a backup set ready so a worn part doesn't force you into a late-night emergency wash.

Your 5-Step Cleaning Routine

1. Disassemble completely: Take apart every piece—flanges, valves, containers, membranes—right after pumping. Rinse each part under cool water to remove milk residue. Checkpoint: If you see milk stuck in crevices, soak parts in cool water for a few minutes before washing.
2. Wash with soap and warm water: Use a dedicated bottle brush and mild dish soap to clean each part thoroughly. Pay special attention to valves and small crevices where milk can hide. Checkpoint: A quick rinse isn't enough—scrub every surface for at least 15–30 seconds.
3. Rinse thoroughly: Rinse every part under running water until no soap film remains. Soap residue can irritate your baby and affect the taste of milk. Checkpoint: If parts feel slippery, you haven't rinsed enough.
4. Sanitize (optional but recommended): If you want to sanitize, boil parts in a large pot for 5 minutes. Use tongs to remove and let cool on a clean towel. Checkpoint: Never boil electrical parts or the motor unit. Check your manual for specific guidance.
5. Air-dry completely: Place parts on a clean, unused dish towel or a dedicated drying rack in a well-ventilated area. Let them dry fully before reassembling. Checkpoint: If you see water droplets inside the flanges or valves, wait longer—moisture can cause mold and bacteria.

Products That Help with Cleaning and Hygiene

• Willow Wave Manual Breast Pump: Wearable completely in-bra (no air horns here!) so you can pump discreetly. 5 oz capacity with splashguard and easy-pour spout. No charging necessary — perfect for travel. With fewer parts and no electronics, the Willow Wave is one of the easiest pumps to clean. You can hand wash and air-dry it anywhere, making it ideal for travel or a backup pump.
• CoBoo Natural Pumping Spray: Pump longer and more comfortably with CoBoo Natural Pumping Spray, designed to lubricate your skin while you pump. Simply spray on your Willow 3.0 or Willow Go flanges and see the benefits after just one session. Spraying a thin layer on your flanges reduces friction, which can help you pump longer without discomfort. It's a simple addition to your pumping routine that makes cleaning easier too, because the flanges don't stick to your skin.
• Willow Sync Backup Parts Set: Replacing Your Parts For optimal output, replace every 90 days (or when you notice discomfort or signs of wear). Having a backup set means you're never tempted to skip a wash cycle or reuse a worn part. Replacing parts consistently keeps suction strong and milk flow steady.
• Willow Go® Splashguard Container Set (2-pack): Willow Go's reusable milk containers make pumping and transferring milk a breeze. Replacing Your Parts For optimal output, replace every 90 days (or when you notice discomfort or signs of wear). With a spare set of containers, you can rotate between washes and drying cycles. This reduces the risk of bacteria from damp parts and keeps your routine efficient.

Keeping your wearable breast pump parts clean and sanitized doesn't require a sterilizer. With a simple routine of washing, boiling, and air-drying, you can protect your baby and keep your pump working well. Replace parts when they show wear, and consider a backup set so you're never caught without a clean pump.