Value Village ／ Food & living
This answer is a draft. It stays unpublished until legal review and source verification are complete.
Reusable bottles are everywhere now, but "what can I put in it?" and "how do I wash it?" are common questions in every country. In Japan, cases of metal leaching into acidic drinks kept in metal bottles have been reported, and public bodies have issued warnings. Here is what Japanese makers and consumer authorities say.
| Care | Guide |
|---|---|
| Every day | Straight after use, with neutral washing-up liquid and a soft sponge. Take off the lid and the gasket (パッキン, pakkin) and wash them separately |
| About once a week | Check the gasket and the grooves of the lid for grime. For mould, use oxygen bleach (酸素系漂白剤, sanso-kei hyōhakuzai) — check the product label first |
| Do not use | Metal scourers, abrasive cleaners, chlorine bleach (they scratch and corrode the inside) |
| Drying | Dry completely and store with the lid off |
[Verify] Check the year and details of the Tokyo case in the published material of the Tokyo Metropolitan Bureau of Public Health, and the fizzy-drink incidents in the reports of the National Consumer Affairs Center of Japan.
Stainless steel can corrode where it has been scratched. If you can see scratches or peeling inside, stop using the bottle — that is the safe side.
Sports drinks are acidic and contain salt, which makes them one of the drinks most likely to dissolve metal. If you fill up with one, keep it short and finish it, or use a bottle sold as suitable for sports drinks.
As the drink cools, bacteria grow more easily. Take special care with drinks containing sugar or starch, such as barley tea (mugicha) and sports drinks. The basic rule: finish the drink the same day and wash the bottle every day.
The grooves of the lid and the underside of the gasket are where mould appears first. Most makers say to remove and wash them every time.
Most vacuum-insulated bottles are not dishwasher-safe. High temperatures can peel the coating and reduce the insulation. Check the label.
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https://www.hokeniryo.metro.tokyo.lg.jp/shokuhin/
https://www.kokusen.go.jp/news/data/n-20200820_1.html
https://www.caa.go.jp/policies/policy/consumer_safety/caution/
⚠️ Editorial note: the source URLs above were identified by search. Our working environment cannot reach go.jp domains, so the contents have not been checked against the text. Verify every source before publication and record who checked it and when.
What we share here are ideas and everyday practices passed down among people living in Japan, together with general information drawn from public sources. They are not official recommendations, and they are not professional instruction. Practices vary between households and regions.
This is general information. Results vary from person to person and depend on your own conditions and surroundings.
Please decide for yourself, using your own judgement, whether any of this suits your situation. We cannot accept responsibility for any damage, loss or injury arising from following this article.
Some ingredients need thorough cooking. Eat raw only foods that are sold for raw consumption. If you have allergies, check the ingredients.
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