Should I wash secondhand clothes before wearing them? What about smells and mites?
This answer is a draft. It stays unpublished until legal review and source verification are complete.
Buying clothes on Mercari (Japan's biggest flea-market app), in reuse chains or in vintage shops is now completely normal in Japan. Some people worry that anything not new is unhygienic; others wear it straight from the bag. Here are the real risks, and how Japanese households deal with a secondhand purchase.
Care after buying
| Item | Care | Purpose |
|---|---|---|
| Cotton or synthetic tops and bottoms | Wash according to the care label. If possible 40°C or above, or a hot tumble-dry. For strong smells, soak 1 hour in bicarbonate of soda (1 tablespoon per litre of water) or oxygen bleach (酸素系漂白剤, sanso-kei hyōhakuzai) at 40–50°C (104–122°F) before washing | Removes sebum, dust and odour; deals with mites |
| Knitwear and wool | Delicates wash (30°C / 86°F or below, neutral detergent) or dry cleaner. Check for moth holes | Any moth eggs come out in the wash |
| Jackets and coats (not washable) | Dry cleaner, or steam all over (iron or garment steamer) and dry in the shade, plus deodorising spray | Odour and surface dust |
| Leather and suede | Wipe with a dry cloth, leather cleaner, then conditioning cream. Dry in the shade | Removes mould and odour |
| Shoes | Remove and replace the insoles, wipe the inside with alcohol, antibacterial spray, dry in the sun | Removes foot bacteria and odour |
| Bags | Empty out debris and wipe the inside. Wash fabric bags according to the label | — |
| Hats and scarves | Wash according to the label, or steam and shade-dry | The scalp produces a lot of sebum |
- Bedbugs (トコジラミ, tokojirami): in recent years Japan has seen outbreaks via hotels and secondhand goods. Eggs, nymphs and adults all die at 60°C or above, so use 30 minutes on a hot tumble-dry, or run an iron or steamer along the seams. Freezing (−18°C / 0°F for 4 days or more) also works. For peace of mind, bring the clothes home still in their plastic bag and deal with them before spreading them around the house.
- Mites: the mites in fabric are mostly house-dust mites, which do not bite, but their droppings and remains are allergens. They wash out, and die at 50°C (122°F) or above.
- Musty and storage smells (the typical vintage-shop odour): residual mothball smell (naphthalene) and trapped damp. Two or three days in a well-ventilated shady spot, a bicarbonate-of-soda soak, oxygen bleach or steam removes most of it. If not, take it to a dry cleaner and say "smell" (におい, nioi).
- Infection: the infection risk from ordinary secondhand clothes is generally described as low, and washing lowers it further. Athlete's foot (a fungal infection) can be passed on via shoes and socks, so clean the inside of shoes and replace the insoles.
- What to check when buying: yellowing at the underarms and collar (hard to remove), tiny moth holes (knitwear), spots of mould, a strong mothball smell (wool and cashmere are often long-stored), loose seams, sticky leather (hydrolysis of synthetic leather = end of its life).
- If you are the seller: wash and dry before listing is the basic etiquette of Japan's flea-market culture. Writing "washed" (洗濯済み, sentaku-zumi) improves your ratings.
[Verify] The kill temperature and freezing conditions for bedbugs, and the kill temperature for mites, follow general pest-control materials. Check with municipal or Ministry of Health, Labour and Welfare sources.
Misunderstanding 1｜If it is labelled "dry-cleaned", I need not wash it
Since being cleaned it has been tried on and stored on the shop floor, picking up smells and dust. Wash it once at home, or steam it and dry in the shade.
Misunderstanding 2｜Secondhand clothes are unhygienic and dangerous
The infection risk from normal use is low, and washing lowers it further. What matters is sebum, odour and insect eggs, and household methods handle all three.
Misunderstanding 3｜Sunlight takes the smell out
Sunlight fades colour; mothball and musty smells come out with ventilation and washing. Shade-dry plus a soak.
Misunderstanding 4｜Bedbugs are a problem abroad, not in Japan
Reports inside Japan have risen in recent years. 30 minutes on a hot tumble-dry, or freezing, deals with them reliably.
Misunderstanding 5｜A synthetic-leather bag or shoe can be polished back to life
Synthetic leather (polyurethane) starts to hydrolyse a few years after manufacture; stickiness and peeling cannot be reversed. If it feels sticky in the shop, leave it.
---
Sources
- Ministry of Health, Labour and Welfare, "Measures against bedbugs" [トコジラミ（ナンキンムシ）対策について]
https://www.mhlw.go.jp/stf/seisakunitsuite/bunya/kenkou_iryou/kenkou/seikatsu-eisei/
- Consumer Affairs Agency, "The new care labels (JIS L0001)" [新しい洗濯表示（JIS L0001）]
https://www.caa.go.jp/policies/policy/representation/household_goods/laundry_symbols/
- Tokyo Metropolitan Institute of Public Health, "Biology and control of mites and bedbugs" [ダニ・トコジラミの生態と防除]
https://www.tmiph.metro.tokyo.lg.jp/
⚠️ 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.
About this article
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.
Follow the care label and the maker's instructions for any garment, shoe or bag. For expensive or sentimental items, ask a specialist cleaner or repairer.
Sources
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