Domakihub How to Clean a Reusable Water Bottle the Right Way
Remove hidden mould, odours, and bacteria in five straightforward steps.
Reviewed by Domakihub cleaning pros · 2026-06-23 · 4 min read
A reusable water bottle is one of the most-touched items in any home, holiday rental, or hotel room — and one of the least-often properly cleaned. The video above walks through the full deep-clean and sanitising process; this article breaks the same method into five clear steps you can follow with supplies already in your kitchen. Whether you manage a single household or a portfolio of rental properties in Greece, these steps keep every bottle hygienic and odour-free.
Why reusable bottles get dirty faster than you think
Bacteria thrive in the warm, moist interior of a water bottle. Biofilm — a thin, slippery layer of microorganisms — starts forming within 24 hours of rinsing with plain water, particularly around the neck, lid threads, and any straw or spout mechanism. In Greece's warm climate, that process accelerates even further.
Regular rinsing is not enough. Studies have found that inadequately cleaned bottles can harbour more bacteria than a kitchen sink. For holiday rentals and hotels this is not just a comfort issue — it is a basic hygiene obligation for guests.
What you need before you start
You do not need specialist products. A bottle brush, dish soap, white vinegar, and bicarbonate of soda (baking soda) cover the vast majority of cleaning scenarios. For stainless-steel bottles specifically, avoid bleach and abrasive scrubbers, which can damage the interior coating and affect taste. Plastic bottles tolerate diluted bleach sanitising, but air-dry fully before use to prevent lingering chemical taste.
5 steps to a thoroughly clean water bottle
- 1
Disassemble every component
Unscrew the lid, remove the silicone gasket or seal ring, detach any straw, and separate the straw cap if present. Cleaning the bottle as a single unit leaves the threads, gasket groove, and straw interior untouched — which is where mould and odour actually originate.
- 2
Wash all parts with hot soapy water
Fill the bottle with hot water and a few drops of dish soap, then use a long bottle brush to scrub the interior walls, base, and neck. Scrub the lid, gasket, and straw separately with a small straw brush or an old toothbrush. Hot water (not boiling for plastic) loosens grease and food residue that cold water leaves behind.
- 3
Deodorise with bicarbonate of soda
If the bottle has an off smell after washing, add one teaspoon of bicarbonate of soda and fill with warm water. Leave for 30 minutes, then scrub and rinse thoroughly. Bicarbonate neutralises acidic odour compounds from coffee, sports drinks, or fruit infusions without leaving any residue or taste.
- 4
Sanitise with white vinegar or diluted bleach
For a weekly deep clean, fill the bottle with a solution of equal parts white vinegar and water. Leave for 15 minutes, then rinse well — vinegar is a mild acid that kills the majority of common bacteria and dissolves mineral scale from hard water (a frequent issue with Greek tap water). For plastic bottles you want to fully sanitise, a solution of one teaspoon of household bleach per litre of water works effectively; rinse at least twice and air-dry completely.
- 5
Air-dry upside-down, fully disassembled
Place the bottle upside-down on a clean drying rack with the lid, gasket, and straw laid separately beside it. Never reassemble a bottle while any part is still damp — trapped moisture is the primary cause of mould growth. In a rental or hotel context, dry bottles overnight before returning them to rooms.
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FAQ
- How often should a reusable water bottle be cleaned?
- Ideally after every use, or at minimum once a day for a bottle in daily use. The lid, gasket, and straw should be given a thorough brush clean at least every two days, and a full vinegar sanitising treatment once a week. In a rental property, treat every bottle as a shared item and sanitise between guest stays.
- Can I put a reusable water bottle in the dishwasher?
- It depends on the material. Most stainless-steel bottles are not dishwasher-safe — high heat and harsh detergent can damage vacuum insulation, warp lids, and degrade rubber seals. Check the manufacturer label first. Many plastic bottles marked 'dishwasher-safe' can go on the top rack, but hand-washing remains gentler and ensures the interior is actually scrubbed, not just rinsed by the machine.
- How do I remove stubborn mould from a water bottle?
- Mix one tablespoon of bicarbonate of soda with two tablespoons of white vinegar and a cup of warm water, pour into the bottle, and leave for one hour. Then scrub vigorously with a bottle brush, paying particular attention to the neck and base. For visible mould on a gasket or straw, soak those parts in undiluted white vinegar for 30 minutes. If mould remains after two attempts, replace the lid, gasket, or straw — they are inexpensive and not worth the hygiene risk.