How to Clean Eufy S1 Pro Breast Pump

Keeping your Eufy S1 Pro breast pump clean is essential for your baby’s health and the pump’s longevity. This guide walks you through every step—from disassembly to drying and storage—so you can maintain a hygienic pumping routine with confidence.

Key Takeaways

• Disassemble completely: Always take apart all removable parts before cleaning to avoid hidden milk residue and bacteria buildup.
• Wash immediately after use: Rinse parts with cool water right after pumping to prevent milk from drying and sticking to surfaces.
• Use mild, baby-safe soap: Choose fragrance-free, non-toxic dish soap to ensure no harmful chemicals come into contact with your breast milk.
• Sanitize regularly: Steam sterilize or use a UV sterilizer at least once daily, especially if pumping frequently or your baby has a weakened immune system.
• Air dry on a clean rack: Never towel-dry pump parts—use a dedicated drying rack to prevent contamination from fabric fibers.
• Store in a clean, dry place: Keep assembled or disassembled parts in a sealed container or bag to protect from dust and moisture.
• Replace worn parts: Check valves, membranes, and flanges monthly and replace them every 3–6 months or as recommended by Eufy.

How to Clean Eufy S1 Pro Breast Pump: A Complete Step-by-Step Guide

Congratulations on choosing the Eufy S1 Pro breast pump—a quiet, efficient, and portable option for modern moms. But like any breast pump, its performance and safety depend heavily on proper cleaning and maintenance. Cleaning your Eufy S1 Pro correctly isn’t just about hygiene—it’s about protecting your baby’s health, preserving your milk supply, and extending the life of your pump.

In this comprehensive guide, you’ll learn exactly how to clean every component of your Eufy S1 Pro, from the flanges to the motor unit. We’ll cover daily cleaning routines, deep sanitizing methods, troubleshooting tips, and best practices for storage. Whether you’re a first-time pumper or switching from another brand, this guide ensures you’re doing it right—every single time.

Why Cleaning Your Eufy S1 Pro Matters

Breast milk is a rich source of nutrients—and unfortunately, it’s also a breeding ground for bacteria if not handled properly. Residual milk left in pump parts can spoil quickly, leading to mold, unpleasant odors, and even infections like mastitis. Proper cleaning eliminates harmful bacteria, prevents cross-contamination, and ensures your baby drinks only fresh, safe milk.

Additionally, milk buildup can clog valves and reduce suction efficiency, making pumping less effective over time. Regular cleaning and part replacement keep your Eufy S1 Pro working like new. The good news? The Eufy S1 Pro is designed for easy cleaning, with dishwasher-safe parts and minimal crevices where milk can hide.

What You’ll Need to Clean Your Eufy S1 Pro

Before you start, gather these essentials:

• Cool or lukewarm running water
• Mild, fragrance-free dish soap (baby-safe preferred)
• A clean basin or sink dedicated to pump parts (not used for food prep)
• A bottle brush or small cleaning brush
• A clean drying rack (preferably one designed for baby items)
• Paper towels or a clean cloth (for wiping non-washable parts)
• Steam sterilizer, UV sterilizer, or access to a microwave (for sanitizing)
• Ziplock bag or airtight container (for storage)

Tip: Avoid using harsh chemicals, bleach, or antibacterial wipes—these can leave residues that are unsafe for your baby.

Step 1: Disassemble the Eufy S1 Pro Completely

The first and most important step in cleaning is full disassembly. Never skip this—even a tiny bit of leftover milk can cause problems.

How to Take Apart Your Pump

• Remove the milk collection bottles from the flanges.
• Twist off the flanges from the breast shields.
• Detach the valves and membranes from the flanges. These are small, delicate parts—handle them gently.
• Remove the tubing from the motor unit (if applicable—note that the S1 Pro uses a closed system, so milk doesn’t enter the tubing, but it should still be checked).
• Take off any silicone seals or gaskets.

Pro Tip: Lay out all parts on a clean towel as you disassemble them. This helps you keep track and ensures nothing gets lost—especially those tiny valves!

Step 2: Rinse Immediately After Pumping

As soon as you finish pumping, rinse all parts that came into contact with breast milk under cool or lukewarm running water. Never use hot water right after pumping—it can cause milk proteins to “cook” onto surfaces, making them harder to clean.

Why Cool Water First?

Cool water helps prevent milk from coagulating and sticking to plastic. It’s especially important for the valves and membranes, which have tiny channels that can clog easily.

Rinse each part thoroughly, including the inside of the flanges, bottles, and valves. Shake off excess water, but don’t dry yet—move straight to washing.

Step 3: Wash with Mild Soap and a Brush

Now it’s time to scrub away any remaining residue.

Washing Instructions

• Fill a clean basin with warm water and add a few drops of mild dish soap.
• Submerge all washable parts: flanges, bottles, valves, membranes, caps, and seals.
• Use a bottle brush to clean the inside of the bottles and flanges. Pay special attention to the narrow openings where milk can hide.
• Gently scrub the valves and membranes with your fingers or a soft brush. These parts are delicate—avoid using anything abrasive.
• Rinse each part under running water until all soap is gone. Soap residue can affect taste and safety.

Important: The motor unit and tubing should never be submerged in water. Wipe the exterior with a damp cloth if needed, but keep it dry.

Step 4: Sanitize for Extra Safety

Washing removes visible residue, but sanitizing kills bacteria, viruses, and mold. Sanitizing is especially important if you’re pumping frequently, storing milk for later, or your baby was born prematurely or has health concerns.

Option 1: Steam Sterilization (Recommended)

Use a steam sterilizer (electric or microwave-safe). Most Eufy S1 Pro parts are compatible with steam sterilization—check the manual to confirm.

• Place all clean, rinsed parts in the sterilizer.
• Follow the manufacturer’s instructions for cycle time (usually 5–10 minutes).
• Allow parts to cool before removing.

Option 2: Boiling (If No Sterilizer Available)

Boiling is a reliable alternative, but not all parts may be boil-safe. Check your Eufy manual first.

• Use a large pot with enough water to fully submerge parts.
• Bring water to a rolling boil, then add parts.
• Boil for 5 minutes.
• Use tongs to remove parts and place them on a clean drying rack.

Option 3: UV Sterilizer

UV sterilizers use ultraviolet light to kill germs without heat. They’re gentle on parts and great for daily use.

• Place clean parts inside the UV sterilizer.
• Run a full cycle (typically 5–15 minutes).
• Store immediately after use.

Note: Sanitize at least once per day. If you pump more than 3–4 times a day, consider sanitizing after every use.

Step 5: Dry Properly on a Clean Rack

Drying is just as important as washing. Never towel-dry pump parts—fabric can transfer bacteria and lint, which may contaminate your milk.

Best Drying Practices

• Use a dedicated drying rack with good airflow.
• Place parts upside down to let water drain out completely.
• Allow parts to air dry for at least 1–2 hours, or until completely dry.
• Ensure the room is clean and dust-free while drying.

Pro Tip: If you’re in a hurry, you can use a clean paper towel to gently pat dry the outside of bottles and flanges—but never the inside or valves.

Step 6: Store Safely Until Next Use

Once dry, store your pump parts properly to keep them clean and ready for the next session.

Storage Options

• Assembled: Some moms prefer to store the pump fully assembled in a clean ziplock bag. This saves time but increases the risk of moisture buildup—only do this if parts are 100% dry.
• Disassembled: Store parts separately in a sealed container or resealable bag. Label it “Clean Pump Parts” to avoid confusion.
• In the Fridge (Short-Term): If you’re pumping multiple times a day, you can store clean, dry parts in the refrigerator between uses (up to 24 hours). This reduces the need to wash after every session.

Warning: Never store damp parts—this encourages mold and bacteria growth.

Cleaning the Motor Unit and Tubing

The Eufy S1 Pro features a closed-system design, meaning milk never enters the tubing or motor. However, you still need to maintain these parts.

Motor Unit Care

• Wipe the exterior with a soft, damp cloth after each use.
• Never submerge or spray water directly on the motor.
• Use a dry cloth to remove dust or moisture from vents.
• Store in a dry, cool place when not in use.

Tubing Maintenance

• Check tubing regularly for condensation, mold, or discoloration.
• If moisture builds up, disconnect the tubing and let it air dry completely before reattaching.
• Replace tubing every 3–6 months or as recommended by Eufy.

Note: If you notice a drop in suction, check the tubing for blockages or wear. Damaged tubing can affect performance.

How Often Should You Clean and Replace Parts?

Consistency is key to maintaining your Eufy S1 Pro.

Cleaning Frequency

• After every use: Rinse and wash all milk-contact parts.
• Daily: Sanitize at least once (preferably after the last pump of the day).
• Weekly: Deep clean the motor unit and inspect all parts for wear.

Replacement Schedule

• Valves and membranes: Replace every 1–2 months or when they become stiff, cloudy, or torn.
• Flanges and bottles: Replace every 3–6 months or if cracked, warped, or discolored.
• Tubing: Replace every 3–6 months or if you notice reduced suction or moisture inside.
• Seals and gaskets: Check monthly and replace if loose or damaged.

Tip: Keep a spare set of valves and membranes on hand—they’re inexpensive and prevent pumping delays.

Troubleshooting Common Cleaning Issues

Even with the best care, problems can arise. Here’s how to handle them.

Issue: Milk Smell or Residue Remains After Washing

Solution: Soak parts in a mixture of warm water and white vinegar (1:1 ratio) for 15–20 minutes. Rinse thoroughly and rewash with soap. Vinegar breaks down milk fats and eliminates odors.

Issue: Valves Are Stiff or Not Working

Solution: This usually means they’re worn out. Replace them immediately. Never try to force stiff valves—they won’t create proper suction.

Issue: Mold in Tubing

Solution: If you see mold, replace the tubing right away. To prevent it, ensure tubing is completely dry before storage and avoid storing the pump in humid areas.

Issue: Pump Loses Suction

Solution: Check for loose connections, worn valves, or clogged membranes. Reassemble carefully and replace any damaged parts.

Tips for Busy Moms: Time-Saving Cleaning Hacks

We know life with a newborn is hectic. Here are some smart shortcuts:

• Use a dedicated pump cleaning station: Keep a basin, brush, soap, and drying rack in one place for quick access.
• Pre-rinse and refrigerate: If you can’t wash right away, rinse parts and store them in the fridge for up to 24 hours.
• Buy a second set of parts: Alternate between sets so you always have clean ones ready.
• Use a dishwasher (if compatible): Some Eufy parts are top-rack dishwasher safe—check the manual. Use a gentle cycle and air-dry.
• Set a cleaning reminder: Use your phone to remind you to sanitize daily.

Final Thoughts: Make Cleaning a Habit

Cleaning your Eufy S1 Pro breast pump may seem like a chore, but it becomes second nature with practice. By following these steps, you’re not only protecting your baby’s health—you’re also ensuring your pump lasts longer and performs better.

Remember: consistency beats perfection. Even if you can’t sanitize after every single pump, doing it daily and washing thoroughly each time makes a huge difference. Keep your parts organized, replace them on schedule, and don’t hesitate to reach out to Eufy support if something seems off.

With a clean pump, you can pump with peace of mind—knowing your baby is getting the safest, freshest milk possible.