A typical scenario (an illustrative situation drawn from common experience, not a review from any specific customer)

A shop that sells "clean", and a musty smell rising from the drums

Tom has run a coin-operated laundromat for almost six years in a side street in Bueng Kum, in eastern Bangkok. The shop fills two ground-floor shophouse units: twelve front-loading washers, eight dryers, a long folding table, a bench, a coin changer and a detergent vending machine. At the back is a small room for his drop-off wash-and-fold service, with shelves of baskets belonging to regular customers, bags of pressed clothes waiting for delivery, and one bathroom.

Between 24 and 27 September 2026 the rain did not stop. According to news reports, around 300 mm fell in roughly 48 hours, and the drains could not keep up. Tom switched off the main breaker and lifted the customers' baskets to the top shelves. The water still came in, rising over the base of every washer, around the legs of the folding table and into the back room. It stayed for days. News reports said canals across eastern Bangkok were full, and Governor Chadchart said drainage would take two to three days after the rain stopped.

When the water finally went down, Tom and his brother shovelled out the mud, hosed the floor, opened every door and ran fans day and night. An electrician checked the wiring, a technician checked every machine, and most still worked. But every time Tom opened a washer door, a sour, swampy smell drifted out. The door gaskets had black streaks. The detergent drawers were slimy. Grey-green spots were appearing on the back-room wall along the old waterline, and the bathroom drain was breathing sewer air back into the shop.

What kept him awake was not the repair bill. It was a LINE message from a regular: "When are you reopening, and are the machines clean? My baby is still small and I'm worried about flood germs." A laundromat sells cleanliness directly. If a customer lifts a freshly washed shirt to her face and smells damp, or notices black mold on a door seal, years of trust can disappear in a day.

Tom's story repeats across laundry shops and laundromats after the Bangkok floods of late September 2026. This article explains why laundries hide germs and mold so effectively, the right order for recovery, and where ozone disinfection fits as the final step before you reopen with confidence.

The 2026 Bangkok floods in brief, and why eastern laundries were hit hard

According to news reports, continuous heavy rain from 24 to 27 September 2026 flooded large parts of Bangkok, and on 26 September the Bangkok Metropolitan Administration declared all 50 districts a disaster zone. Eastern Bangkok was hit hardest, with Khlong Chan and Bueng Kum among the areas mentioned. As of 30 September, some roads, including Si Burapha and Lat Phrao, still had 20 to 40 cm of standing water. Thai media compared the event with the 2011 floods, and one Thai business report cited a Chamber of Commerce estimate of about 12,300 million baht in damage.

Laundromats are almost always on the ground floor of shophouses or commercial buildings, on a main road or in a soi packed with dormitories and condos, because customers need to walk in carrying baskets. The location that wins business on a normal day is the first place water reaches on a flood day. Laundries also have many water inlets, multiple drain lines from the machines, and floor gutters. Each is a doorway for floodwater and backed-up sewage, even when the water in the street is not especially deep.

The lives lost during these floods, including a reported electrocution, are a sober reminder that a shop full of high-powered appliances must have its electrics checked by a qualified electrician before anything is switched on. People's safety comes before germs and smells every time.

Germs and mold in a laundromat after a flood: where they come from and where they hide

Urban floodwater is not clean rainwater. It has run through drains, sumps, rubbish bins, markets and road surfaces, so it carries faecal bacteria, viruses that cause stomach illness, rat urine that may carry leptospirosis, silt and other contaminants. Once the water drains away, trapped moisture and Bangkok's heat allow mold to grow quickly. WHO and the US CDC both advise cleaning and drying within roughly 24 to 48 hours to limit mold growth. In reality, this flood stood for days, so many shops started recovery well after that window.

Laundromat-specific hot spots

• Front-loader door gaskets: folded rubber that holds water even on a normal day. After a flood, sediment settles in the folds and biofilm and mold follow.
• Detergent drawers and dosing tubes: old detergent residue plus moisture is ideal food for mold.
• Drain lines and floor gutters: sewage may have backed up, leaving sludge and odour inside the pipes.
• Dryer vents and lint ducts: lint that got wet clumps into damp mats that mold colonises easily.
• Folding tables, benches, wooden cabinets and basket shelves, especially plywood or particleboard that soaks water into its core.
• Back-room walls and ceilings, already humid from steam and dryers, where mold often grows along the waterline.
• Air conditioning and exhaust fans, which pull damp air and spores around the whole shop.
• Customer bags, baskets and stored clothing that were splashed or sat in very high humidity for days.

Illnesses and symptoms to watch for

Thailand's Department of Disease Control routinely warns that after floods people should watch for leptospirosis, diarrhoeal disease, skin infections from wading, conjunctivitis and respiratory illness. Indoor mold can trigger allergies, sneezing, a blocked nose, itchy eyes and asthma attacks. Anyone who waded into the shop to rescue stock and then develops fever, headache, muscle pain (especially in the calves), red eyes or repeated diarrhoea must see a doctor promptly and mention the flood exposure. Leptospirosis is treatable when caught early. Ozone treatment or any disinfection is not medical treatment.

Who is most at risk

Laundromat customers include parents washing cloth nappies and babies' clothes, older people living in rented rooms, pregnant women, people with chronic illness or weakened immunity, and people with allergies or asthma. They touch the clothes that come out of your machines and sit in your shop for half an hour or more at a time. Owners and staff are at high risk too during clean-up, because they handle mud, sludge and mold spores directly.

The impacts laundry owners tend to underestimate

Health. Clothes from dozens of households pass through the same machines every day. If a drum or gasket still harbours flood germs, the risk does not stay in the shop. It can follow the laundry home, into bedrooms and onto the skin of small children.

Money. A coin laundry earns per wash and per dry cycle. Every closed day is a full day of lost revenue while rent, machine instalments and wages keep running. But reopening before germs and odour are under control can cost far more in the long run than the few days of takings you win back.

Time. Cleaning machines one by one, scrubbing gaskets, washing drawers, flushing pipes and repainting walls takes days. Do it in the wrong order, for example painting over a damp wall, and the mold returns within weeks and the whole job starts again.

Reputation. Laundromats live on regulars and online map reviews. One review that says "clothes came out smelling musty" or "black mold on the washer door" can send new customers straight to a competitor. After a flood, when the whole city is worried about germs, that reaction is even stronger.

Family and team. Many laundries are family businesses with living quarters upstairs, so the household breathes the same air as the shop. Spores from a moldy back room can drift up the stairs into bedrooms.

Why the usual fixes fall short in a laundromat

1. Bleach on the surfaces you can see. Bleach helps on smooth surfaces you can reach, but a laundry is full of places a cloth never touches: behind washers pushed against the wall, under dryers, deep inside gasket folds, inside vents. And mixing bleach with other cleaners, especially ammonia- or acid-based products, can release dangerous gases. Never mix chemicals yourself.

2. Fans on full blast. Fans speed up drying, which is good, but they do not kill anything. In a room where mold has already started, strong airflow can spread spores across the shop and onto folded clothes waiting for pickup.

3. Air freshener and scented candles. A laundromat already trades on the fresh smell of fabric softener, so many owners assume fragrance will cover the musty note. It only masks it. The source, mold and bacteria, is still there, and sensitive customers notice two smells layered together, which is more worrying than either.

4. Painting over mold stains. Fresh paint makes the shop look clean for a few days. If the wall behind is still wet and moldy, the stain bleeds back through, the paint blisters, and it all has to be stripped.

5. One hot empty wash cycle. Running the machines' drum-clean programme is a must, but it does nothing for the shop air, walls, ceiling, folding table, benches, storage room or air conditioning, all of which are mold sources that affect clean clothes.

Each method treats only part of the problem. A laundry needs a whole-space step after mechanical cleaning is finished.

WHD ozone disinfection for laundromats and laundry shops

Ozone (O₃) is a gas made of three oxygen atoms with strong oxidising power. Released into a closed space, it spreads into corners, behind machines, under tables and through the air where a cloth cannot reach. Ozone breaks down the cell structures of bacteria and mold and the outer layers of viruses, and it breaks odour molecules apart at the source. Afterwards it reverts to oxygen (O₂), so it leaves no chemical residue on folding tables, shelves or any surface that customers' clothes touch. That matters for a shop that does not want chemical smells on fresh laundry.

According to the company's certified test results, World Health Disinfection (WHD) ozone treatment has been tested by Thailand's Department of Medical Sciences and by Intertek (UK), eliminating viruses, bacteria and mold by 99.99% under test conditions. Read more on the residential and building ozone disinfection service page.

Ground rules before you book

• The space must be empty. During treatment the shop is closed and sealed, with no people, pets or plants inside. Nobody re-enters until the rest and ventilation period the team specifies has ended. If there is living space upstairs that shares stairs or air paths with the shop, plan with the team to seal it off or have everyone leave temporarily.
• Clean and dry first. Ozone comes after mud removal, washing, scrubbing and drying. It does not replace cleaning. If mud is still present, the ozone is used up on that dirt and results drop.
• Machines are checked by technicians first. The ozone team does not inspect wiring or repair washers. Qualified electricians and machine technicians handle that beforehand.
• Anyone unwell sees a doctor. Disinfecting the shop lowers environmental risk. It is not a cure.

How the job runs in a laundry

1. Survey and zoning. The team walks the front counter, washer zone, dryer zone, drop-off room, storage and bathroom, sizing each area and noting visible mold, remaining damp and leaks to the outside.
2. Preparation. Customer clothes awaiting delivery are taken out or moved to an agreed place. All washer and dryer doors are opened so gas reaches drums and gaskets, detergent drawers are pulled out, cabinets and drawers are opened, and windows and vents to the outside are closed.
3. Ozone release. The generator runs zone by zone. A typical cycle is about 30 minutes per zone, covering the fill and contact time.
4. Rest and ventilation. After the cycle, the ozone is left to revert to oxygen and the space is ventilated. People return only after this period.
5. Handover and advice. The team explains humidity control, leaving washer doors open between uses, and which spots to watch over the following weeks.

10 reasons a flooded laundromat should consider ozone before reopening

1. The gas reaches what cloths cannot: behind machines, under dryers and in the narrow gaps between units installed side by side.
2. It works on airborne mold, not just surfaces, which matters in a shop where clean clothes are folded in the same air.
3. No chemical residue, because ozone reverts to oxygen, so nothing transfers to customers' laundry. See the service details.
4. It breaks down musty odour at the source, so fabric softener becomes the only scent in the shop again.
5. It is quick: about 30 minutes per zone, which helps you plan a reopening date once cleaning is done.
6. It is backed by testing from Thailand's Department of Medical Sciences and Intertek (UK), according to the company's certified results. Read about ozone disinfection.
7. It covers the back room and storage, the most humid areas where mold usually appears first.
8. It is something you can tell customers. Saying the shop was washed, dried and ozone-disinfected builds confidence while the city is anxious.
9. It pairs with surface disinfection. After reopening you can still wipe high-touch points with a medical-grade disinfectant, and jobs of 15,000 baht or more receive a free medical-grade disinfectant spray under the current promotion. Ask about the promotion.
10. The team works across building types, including homes, condos, hotels, offices, factories, schools and hospitals, so they understand spaces full of machinery and members of the public.

Before and after: how the shop changes

Note: results depend on the extent of damage, remaining moisture and the cleaning done beforehand. Materials permanently damaged by floodwater should be replaced.

Example case: a drop-off laundry near Lat Phrao

An illustrative example of how the work fits together, not a real customer review.

Noon runs a drop-off wash-and-press laundry in a soi off Lat Phrao, serving office workers and nearby dormitories. She has three large commercial washers, two dryers, five ironing boards and a full wall of rails for pressed shirts. News reports said Lat Phrao Road still had standing water on 30 September, so her shop stayed shut for days. The water inside was not deep, but it lingered, and the trapped humidity let mold grow along the bottom of the walls, on the ironing-board legs and on the garment covers hanging lowest on the rails.

She worked in order. First, she called every customer with clothes in the shop, separated anything the water had touched, rewashed it hot where care labels allowed, and told customers honestly what had happened. Second, an electrician checked the wiring, sockets and every machine. Third, she threw away the wet ironing-board pads and covers, because absorbent materials are very hard to clean completely. Fourth, she washed floors and walls, scrubbed mold following safety advice, and ran dehumidifiers with the doors open until the walls were dry. Fifth, she booked the ozone team for a day when the shop was completely empty, with every customer garment moved elsewhere first. Sixth, after the rest and ventilation period, she wiped high-touch points with disinfectant and reopened.

On reopening day she put a small sign at the counter explaining exactly what had been done. No exaggerated claims and no promise of "100% germ-free", just the steps. The example shows that ozone is one piece of a bigger picture. The result comes from doing every step, in the right order.

Laundromat recovery checklist after the 2026 Bangkok floods

Before you go in and during clean-up

• Do not switch anything on or plug anything in until a qualified electrician confirms it is safe.
• Wear boots, rubber gloves, a mask and eye protection while shovelling mud and scrubbing mold. Cover any cuts on hands or feet with waterproof dressings.
• Photograph all damage before cleaning, for insurance or assistance claims.
• Separate customer clothing that touched floodwater immediately, inform the owners and deal with it appropriately. Do not store it with dry items.
• Discard absorbent items that were soaked: ironing pads, foam-padded bench cushions, cardboard boxes and doormats.
• Wash floors, walls, table legs and shelves with clean water and detergent. Never mix different chemicals.
• Have a washer technician check inlet hoses, drain lines, pumps, gaskets and detergent drawers, then run the manufacturer's drum-clean cycle.
• Clean dryer lint ducts and vents. Lint that got wet and dried can be both a fire load and a mold source.
• Ventilate, run dehumidifiers and wait until walls and floors are fully dry before painting or installing anything new.
• Clean the air conditioning and replace filters if moisture reached them.

On ozone day

• Remove customer clothing, opened detergent, food, pets and plants.
• Open washer and dryer doors, detergent drawers, cabinets and table drawers.
• Close windows, doors and outside vents as the team advises.
• Put up "do not enter" signs and let neighbours and anyone upstairs know the schedule.
• Nobody stays inside during treatment. Re-enter only after the rest and ventilation period.

After reopening

• Leave washer doors open after each use so gaskets and drums dry out.
• Wipe gaskets and wash detergent drawers regularly.
• Disinfect high-touch points such as buttons, the coin changer, the folding table and benches.
• Watch former mold spots for two to three weeks. If mold returns, find the moisture source.
• If you or any staff develop fever, calf pain, diarrhoea or an infected wound, see a doctor straight away.

FAQ: ozone disinfection for laundromats after a flood

1. If I use ozone, do I still need to clean the washers?

Yes. Cleaning the machines to the manufacturer's instructions and having a technician inspect them is always necessary. Ozone is an add-on after mechanical cleaning that tackles germs and odour across the whole space, including gaps you cannot reach. It does not replace scrubbing, flushing pipes or replacing damaged parts.

2. Can part of the shop stay open during treatment?

Not the zone being treated. It must be sealed and empty of people, pets and plants. Most shops book treatment on a day they are already closed or outside opening hours, and return only after the rest and ventilation period.

3. How long does it take?

A typical cycle is about 30 minutes per zone. A shop with several zones takes longer in total, plus rest and ventilation time. The team gives you a clear schedule after the survey.

4. Should customers' clothes stay in the shop during treatment?

No, move them out first, especially finished laundry awaiting delivery, both for customers' peace of mind and to keep the space empty. Clothing that touched floodwater must be rewashed or handled appropriately. Ozone is not a way to clean muddy garments.

5. Mold is already in the wall. Will ozone fix it?

Ozone helps with mold on surfaces and spores in the air. If mold has grown into absorbent materials such as gypsum board or swollen plywood, remove and replace those materials, dry the area, and then treat with ozone so the problem does not keep returning.

6. How often should I repeat it?

For flood recovery, most shops treat once after cleaning is complete and consider another treatment only if damp or mold reappears after repairs. The team advises based on your shop's actual condition.

7. Is there a promotion?

Ozone jobs of 15,000 baht or more receive a free medical-grade disinfectant spray. Call or message on LINE for the current terms.

Sell "clean" with confidence again

Wash, dry, then finish with WHD ozone disinfection before you take in customers' clothes.

Book a shop survey and ozone treatment

Call 065-556-6294 · LINE @whd268 · Email worldhealthdisinfection@gmail.com

Related services

• Residential and building ozone disinfection
• Ozone removal of odours and chemical residue, for paint, cleaning-agent and new-material smells after shop repairs
• Chemgene HLD4H medical-grade disinfectant, for surfaces after cleaning

References

• 2026 Bangkok floods (Wikipedia)
• Al Jazeera: Disaster zone declared across Bangkok
• CDC: Floods
• WHO fact sheets