Domakihub How to Clean a Baby Bottle Safely Every Time
A quick, parent-tested routine that removes milk residue and keeps feeding equipment hygienic.
Reviewed by Domakihub cleaning pros · 2026-06-23 · 4 min read
Keeping baby bottles spotlessly clean is one of those tasks that sounds simple but is easy to get wrong — especially in busy households, holiday rentals in Greece, or hotel family suites where bottles may be shared or stored improperly. The video above walks through a reliable wash-and-sterilise routine; the guide below gives you the same steps in plain text so you can follow them hands-free at the sink. A properly cleaned bottle protects a newborn's developing immune system and prevents the build-up of sour milk residue that is notoriously difficult to remove once dried.
Why Bottle Hygiene Matters More Than You Think
Breast milk and formula both leave a thin protein film inside bottles and on teats. At room temperature — common in Greek summers where kitchens can exceed 30 °C — that film supports bacterial growth within hours. A quick rinse under the tap is not enough; you need to disassemble the bottle completely and reach every recess with a brush.
This applies equally to parents at home, to nannies and au pairs managing multiple feeds per day, and to cleaning staff in apartments or villas where guests travel with infants. Having a documented routine means the task is done consistently, not guessed at each time.
Washing vs Sterilising: What Is the Difference?
Washing removes visible milk residue, grease, and most surface bacteria using soap and mechanical scrubbing. Sterilising goes further and kills the remaining micro-organisms using heat (boiling or steam) or a chemical solution. Both steps are needed for infants under 12 months, after which a thorough wash alone is usually sufficient according to most paediatric guidance.
In practice, sterilising once per day — typically at night — and washing after every single feed is the approach most health organisations recommend. If you only have time for one thing between feeds, always choose washing over sterilising.
How to Clean a Baby Bottle: 5 Steps
- 1
Rinse immediately after every feed
As soon as the feed is over, discard any leftover milk and rinse the bottle, teat, ring, and cap under cool running water. Do not use hot water at this stage — it partially cooks the protein film and makes it harder to remove. A quick cold rinse within a few minutes of use makes every subsequent step easier.
- 2
Disassemble and soak in warm soapy water
Fill a clean washing-up bowl with warm water and a drop of baby-safe washing-up liquid. Submerge all parts — bottle body, teat, retaining ring, cap, and any valves — and let them soak for two to three minutes. This loosens dried milk and allows the brush to glide into narrow channels without force.
- 3
Scrub every surface with a dedicated bottle brush
Use a long-handled bottle brush to scrub the inside of the bottle body, paying extra attention to the base where residue pools. Use a small teat brush (or the fine tip of a combination brush) to push through every hole in the teat and clean the inner dome. Squeeze soapy water through the teat holes to flush residue out. Replace your bottle brush monthly or as soon as bristles splay.
- 4
Rinse thoroughly under running water
Hold each part under fast-running warm water and rinse until no soap bubbles remain. Soap residue left on a teat can irritate a baby's mouth and interfere with feeding. Turn teats inside out if the brand allows it and rinse again. Shake off excess water but do not wipe dry with a cloth — cloths introduce new bacteria.
- 5
Sterilise once a day using your preferred method
Choose the method that suits your setup: boiling (submerge all parts in a pan of water, bring to a rolling boil for five minutes); electric steam steriliser (follow the manufacturer's cycle, usually six to eight minutes); or cold-water sterilising solution (mix to the correct concentration, submerge parts for at least 30 minutes, then let air-dry or use immediately without re-rinsing). Store sterilised bottles assembled in a clean cupboard, not on an open counter.
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FAQ
- How often do I need to sterilise baby bottles?
- For infants under 12 months, sterilise at least once per day after washing. If a bottle has been left out for more than two hours with milk residue inside, wash and sterilise it before the next use regardless of the usual schedule.
- Can I put baby bottles in the dishwasher instead?
- Yes, provided the bottles and teats are labelled dishwasher-safe. Place small parts in a closed mesh basket to stop them falling onto the heating element, and run the hottest cycle available. A dishwasher replaces the washing step but is not a substitute for sterilising — you still need to follow that up with steam or boiling for babies under 12 months.
- What should I do if the bottle still smells of sour milk after washing?
- Soak the bottle in a solution of one teaspoon of bicarbonate of soda dissolved in 250 ml of warm water for 15 minutes, then scrub and rinse again. Persistent odour usually means residue is trapped in a crack or around the base seal — inspect those areas closely and replace the bottle if the smell does not clear after two treatment rounds.