How to Clean Breast Pump Parts

Here’s the whole thing in one breath: after every pumping session, rinse and wash every part that touches your milk with warm water and plain dish soap, then let them air-dry. That’s the foundation, and it’s what actually keeps your milk safe — the FDA says thorough washing with dishwashing soap and warm water is enough, and that you don’t need to sterilize to keep parts sanitary. “Sanitizing” is a separate, once-a-day bonus step, not part of the daily wash. This guide covers exactly how to clean every part, what soap to use, how often, and the handful of mistakes that cause mold and contamination.

Hand-wash

Gentlest

Most control; kindest to silicone parts

Dishwasher

Hands-off

Top rack, closed basket, hot cycle

Electric bottle washer

Automated

Washes, sanitizes & dries in one

Cleaning wipes

Stopgap

On the go — then wash properly

All four have their place. The daily wash is non-negotiable; how you do it is up to your routine.

Which Breast Pump Parts Need Cleaning (and Which Don’t)

Same rule as everything else with a pump: if it touches milk, it gets cleaned after every use. If it’s electric, it only ever gets wiped. Here’s the full breakdown.

Part	Touches milk?	What to do
Flanges / breast shields	Yes	Rinse and wash after every use
Valves and membranes	Yes	Wash gently after every use — hand-washing is kindest to the silicone
Connectors	Yes	Rinse and wash after every use
Collection bottles / wearable cups	Yes	Rinse and wash after every use
Tubing	No (closed-system pumps)	Don’t wash routinely; wipe the outside if soiled
Motor unit, cord, batteries	No	Wipe with a cloth only — never submerge or rinse

Tubing trips a lot of people up. On modern closed-system pumps the tubing never touches milk, so washing it routinely just traps moisture and invites mold. It only needs cleaning if milk or moisture actually gets inside — which is its own job, covered in the guide to cleaning breast pump tubing.

How to Clean Breast Pump Parts After Each Use (Step by Step)

This is the routine that matters most. It’s the CDC’s recommended method, and it takes a couple of minutes once it’s muscle memory.

1. Wash your hands first. Before you handle any part or your milk, wash your hands with soap and water for about 20 seconds. It’s the easiest step to skip and the easiest way to recontaminate clean parts.
2. Store the milk first. Cap the bottle or seal the bag, label it with the date and time, and get it into the fridge, freezer, or a cooler with ice packs.
3. Wipe the pumping area — especially the dials and power switch if you’re using a shared pump — with a disinfectant wipe.
4. Take apart and inspect every part that touched your breast or milk: flanges, valves, membranes, connectors, and bottles. Inspecting as you go is how you catch a cracked valve or cloudy tubing early.
5. Rinse under running water, as soon as you can. Hold each piece under a cool tap to wash off milk residue — rinsing cool first keeps milk proteins from baking on. Don’t fill the sink and dunk them; sink water and drains carry germs.
6. Wash in a dedicated basin. Use a wash basin kept only for pump and feeding parts (not the sink directly), with warm water and dish soap. If your manufacturer allows a brush, use one kept only for infant-feeding items.
7. Rinse thoroughly under running water for several seconds to clear all the soap.
8. Air-dry on a clean towel. Lay parts on an unused dish towel or paper towel somewhere free of dust. Don’t rub them dry — toweling transfers germs and lint.

Don’t forget the basin and brush themselves. Rinse them and let them air-dry after each use, and wash them every few days (the dishwasher’s fine if they’re dishwasher-safe). They’re cleaning your milk parts — they need to be clean too.

Don’t leave parts sitting in a sink full of soapy water to “soak for later.” The CDC has linked infant illness to bacteria that grew on pump parts left improperly cleaned. Wash, rinse, and set them out to dry while they’re fresh.

That’s the wash. The separate once-a-day sanitize — boiling, steam, UV, and so on — has its own full walkthrough in the sterilizing guide.

Cleaning the Pump Motor and Exterior

The motor unit — the body that holds the pump mechanism and battery — plays by completely different rules from the parts. It never goes in water, a dishwasher, a steam bag, or a microwave. Liquid inside the motor is how a working pump becomes a paperweight, and it voids the warranty.

Instead, wipe the housing, dials, and power switch with a clean damp cloth or a disinfectant wipe whenever they look grubby — and especially before each use if you’re sharing a pump or it’s been sitting out. Let it dry before plugging in. The outside of the tubing gets the same treatment: a wipe, not a wash. That’s genuinely all the motor needs, and trying to “deep clean” it does more harm than good.

What Soap to Use

Good news: you almost certainly already own the right soap. Any plain liquid dish soap works for washing pump parts — the kind already by your sink is fine.

The one to avoid is antibacterial soap. The CDC specifically advises against it for pump parts, because it can contain additives and chemicals that aren’t meant for daily washing of items that touch your milk — and there isn’t solid evidence it prevents illness better than plain soap and water anyway. Whatever you use, rinse thoroughly so no soap residue is left behind.

If you’d rather use something purpose-made, these all work fine:

• Mild, fragrance-free dish soap — the simplest, cheapest option.
• Baby-bottle soap (Dapple, Babyganics, and similar) — formulated to rinse clean off feeding items.
• Castile soap — a plant-based, fragrance-free choice.

Skip anything heavily scented or dyed, and you’re set. A dedicated pump or bottle soap is a nice-to-have, not a must-have.

Hand-Washing vs. the Dishwasher

Both are legitimate. Hand-washing gives you the most control and is gentlest on the soft parts; the dishwasher is the hands-off batch option — if your parts are dishwasher-safe.

Hand-washing

Follow the after-each-use steps above: dedicated basin, warm soapy water, rinse, air-dry. It’s the method the CDC and most manufacturers describe first, and it’s the safest default for valves and membranes.

Two small upgrades the pros use: keep two basins if you can — one for washing, one for the rinse — so rinsed parts never touch soapy water again. And if your drying spot is dusty or near a busy kitchen, loosely lay a clean gauze cloth or paper towel over the parts as they dry; it lets air through while keeping airborne bits off freshly cleaned gear.

The dishwasher

1. Check the manufacturer’s instructions first. Not every part is dishwasher-safe, and dishwasher heat can warp parts — damage that usually isn’t covered by warranty.
2. Top rack only. Put small parts in a closed-top basket so they can’t fall onto the heating element.
3. Run a hot wash with a heated-dry or sanitize cycle, which also sanitizes the parts in one go if they’re dishwasher-safe.
4. Remove with clean hands and air-dry anything still damp.

Silicone valves and membranes usually last longer if you hand-wash them — repeated dishwasher heat wears them out faster, and worn parts cost you suction.

Using an Electric Bottle Washer (Baby Brezza & Similar)

If you’re washing parts many times a day, a countertop bottle washer like the Baby Brezza Bottle Washer Pro automates the whole wash-rinse-dry cycle — and most models can sanitize and dry too. Think of it as a mini dishwasher built for bottles and pump parts, using high-pressure jets that reach inside flanges better than a standard dishwasher’s bottom spray.

A few practical notes if you go this route:

• Wearable pump parts (and some specific bottles) may need a dedicated breast-pump rack, sold separately — check fit before you buy.
• Use the maker’s detergent tablets if the unit requires them, and descale it regularly (hard water leaves mineral buildup that shortens its life).
• Confirm your pump brand approves it — a few wearable parts are excluded by the washer’s own guidance, and silicone valves/membranes may still do better hand-washed.

It’s a convenience purchase, not a necessity — plenty of parents do beautifully with a basin and a brush. But for heavy daily pumping, it buys back real time.

Cleaning Wipes: When They Help and When They Don’t

Pump wipes are genuinely useful — just not for the job people hope they’ll do. They’re for surface wiping in a pinch, not a replacement for washing.

Here’s the part the packaging won’t stress: according to the FDA, even if you use wipes, any part that contacts milk should still be washed with dish soap and warm water before you use it again. And the CDC notes wipes can’t reach into all the crevices where milk fat hides. So a wipe buys you time; it doesn’t close the loop.

Where wipes earn their place:

• Out and about — at work, traveling, or anywhere without a clean sink
• Wiping down the motor, dials, and the outside of tubing
• Mopping up the sticky mess from the fridge method until you can wash properly

Look for unscented, alcohol-free, food-safe wipes (Medela and Dapple both make them; a plain baby wipe works in a true pinch). Then wash with soap and water at the next opportunity. For the full sinkless routine, see how to clean a breast pump on the go.

Cleaning Between Uses (and the Fridge Method)

The “fridge hack” — stashing used pump parts in the refrigerator between sessions instead of washing each time — is everywhere in pumping circles. Here’s the honest, sourced version.

The CDC’s position: if you genuinely can’t clean parts thoroughly after a session, you can rinse them and then refrigerate them for a few hours to slow bacterial growth. But — and this is the part that gets left out — refrigeration only slows bacteria, it doesn’t stop them, and no study has shown that rinsing or wiping and then chilling parts is a safe substitute for washing between every use. The CDC also notes infants have become ill from milk contaminated by parts that weren’t cleaned properly.

So treat the fridge method as an occasional bridge, not your everyday routine. Rinse first, chill briefly, and do a proper wash (and your daily sanitize) as soon as you reasonably can. If your baby is very young or has health concerns, that’s a question for your pediatrician — we’ll stick to the equipment side.

A cleaner workaround for long days, especially at work: carry a second set of parts. Pump with one set, seal it away, switch to the spare, and wash everything properly once you’re home. It sidesteps the whole “how do I clean this in an office bathroom” problem without leaning on the fridge as a crutch.

How Often Should You Clean Breast Pump Parts?

After every single use. That’s the rule, and it doesn’t change based on how busy your day is — every milk-contact part, every session.

What people mix up is washing versus sanitizing. They’re two different jobs:

• Washing removes the milk. Do it after every use — non-negotiable.
• Sanitizing knocks down whatever germs survive the wash. Do it once a day, as an extra layer (full methods in the sterilizing guide).

Wash basins and bottle brushes need attention too — rinse them and let them air-dry after each use, and wash them themselves every few days.

Cleaning New Parts Before the First Use

Brand-new parts aren’t ready to use straight out of the box. Wash every milk-contact part with warm soapy water, then sanitize them once, before the first pump — it clears any dust or manufacturing residue from production and shipping. Do the same for a pump that’s been sitting in storage for a long stretch before you bring it back into rotation.

How to Clean Mold From Parts and Tubing

Mold means something stayed wet too long. It usually shows up as black, green, or white spots or streaks — most often inside tubing, where moisture lingers — sometimes with a musty smell. How you handle it depends on what it’s growing on, and the answer for tubing surprises people.

Moldy tubing: replace it, don’t clean it

If you see mold (or milk) inside your tubing, the CDC’s guidance is blunt: throw it away and replace it, because tubing is too hard to clean reliably. Don’t bother soaking it in vinegar and hoping — swap in a fresh set. While you’re at it, check why it happened: milk getting into the tubing usually means the valves or membranes (or backflow protectors) need replacing, or the tubing was attached wrong.

Mold on hard parts

For flanges, bottles, and connectors, you can usually clean visible mold or residue: disassemble, rinse, soak in warm soapy water (a little white vinegar helps with odor and staining), then scrub with a dedicated brush — but only if your manufacturer allows brushing, since it can damage some parts. Rinse thoroughly and air-dry completely. If mold keeps coming back on a part, replace it.

Prevention is the real fix: dry parts fully before storing, don’t over-wash tubing, and never put parts away damp.

Drying and Storing Cleaned Parts

The wash isn’t finished until everything is bone-dry. Lay parts on a clean, unused towel or paper towel in a dust-free spot and let them air-dry — no rubbing, since toweling reintroduces germs and lint. Once they’re completely dry, store the kit in a clean, sealed container or bag.

Quick-dry tricks, drying racks, and the question of storing parts in the fridge get the full treatment in how to quickly dry breast pump parts.

Common Cleaning Mistakes to Avoid

Almost every cleaning problem traces back to this short list:

• Washing parts directly in the sink. Sinks and drains carry germs — use a dedicated basin.
• Using antibacterial soap. The CDC advises against it; plain dish soap is the right tool.
• Leaving parts soaking in soapy water for hours. That’s a bacteria breeding ground — wash and set out to dry while fresh.
• Towel-drying. Rubbing reintroduces germs and lint. Air-dry, every time.
• Treating wipes as a full clean. They’re a stopgap — still wash milk-contact parts with soap and water before reuse.
• Routinely washing closed-system tubing. It doesn’t touch milk, and forcing water in causes mold.
• Trying to rescue moldy tubing. Replace it — don’t clean it.
• Dishwashering parts that aren’t dishwasher-safe. Warping and a voided warranty. Check the instructions first.
• Storing parts while damp. Mold’s favorite invitation.

Frequently Asked Questions