A Story From the Field: Auntie Jit's Shop Was Clean, So Why Did It Still Smell?

Auntie Jit has sold Thai desserts and souvenirs from a two-storey wooden shophouse beside the Amphawa canal for nearly thirty years. The ground floor is her shopfront, opening onto the canal-side walkway, with a timber deck that steps down to a small landing where vendors tie up their boats to sell from the water. Upstairs is where she lives with her granddaughter. Her shop shares a wall with Noi's handwoven cotton clothing shop on the left and Beer's small coffee shop on the right. The whole row is built from timber, the dividing walls are shared, and the crawl space beneath the floors runs unbroken from one end of the row to the other.

During the 2026 floods, the canal rose over its banks and water filled the shop almost to waist height for several days. When it went down, Auntie Jit and her granddaughter scrubbed the floors, washed the walls, threw away every dessert and ingredient the water had touched, and paid someone to spray disinfectant inside her shop. For two or three days it seemed better. By the following week the musty, muddy smell was back, and a new patch of white mold had appeared on the wall she shares with Noi.

When she went next door to talk, she found out why. Noi had gone upcountry to help her own family and had not been able to clean her shop yet. Piles of soaked cotton fabric were still sitting inside. Every night, damp air and odor from next door seeped through the timber wall and along the crawl space into Auntie Jit's shop. This is something particular to the canal-side wooden rows of Amphawa: the shops are not truly separate, so one shop's problem quickly becomes the whole row's problem.

Why Canal-Side Wooden Rows Have to Be Treated as One Building

• Shared timber walls. Many older wooden rows use a single layer of planks to divide two shops. Moisture and mold spores pass easily through the joints between the boards.
• A continuous crawl space. Mud and debris left under one shop keep releasing odor that travels the length of the row.
• Connected roof spaces. Ventilation gaps under the roof are often open from one end of the row to the other, so musty air rises and spreads into every upstairs room.
• Old timber holds water. Aged teak and other hardwoods dry slowly. The surface may look dry while the inside is still damp, giving mold a long-term home.
• Different stock in every shop. Dessert shops, fabric shops, coffee shops and souvenir stalls each hold different materials that absorb odor or feed mold, and they all affect each other.

In practice, this means the "building" you need to think about is not your shop. It is the whole row. Treating one room in isolation is a bit like drying one corner of a wet towel: the moisture simply spreads back from the parts that are still wet, and within days the problem looks the same as before.

How the Flood Hurts Canal-Side Shops

• Health of families and vendors. Many shopkeepers live upstairs. Children and older people sleeping above a moldy shop may cough, sneeze or have allergy flare-ups. Anyone who waded through floodwater moving stock is at risk of skin infections, diarrhoea and leptospirosis. A high fever with aching calves after being in floodwater is a reason to see a doctor.
• Food safety. Dessert shops, food stalls and coffee shops must throw away all food and ingredients that touched floodwater, and food preparation areas must be genuinely clean before they reopen.
• The image of the market. Visitors walk past many shops in a row. If the walkway smells musty, their impression of the whole market changes.
• Stock damaged a second time. Fabric, woven bags, wooden souvenirs and wrapping paper absorb odor and grow mold even if they never touched the water.
• Money spent without lasting results. If you clean one shop and the smell returns from next door, you end up paying twice.

Common Fixes in Wooden Shophouses That Do Not Last

• Pouring bleach on timber walls. It stains and bleaches the wood, can damage the surface of valuable old timber, and does not reach mold deep in the grain.
• Painting or varnishing straight away. If the wood is still damp inside, the new finish will blister and mold will grow underneath it.
• Burning incense to mask the smell. It only works briefly, and the scent can cling to desserts and drinks.
• Cleaning only the shopfront. The crawl space, the underside of the deck and the upstairs rooms are often the main odor sources and get forgotten.
• Every shop cleaning on a different day. The shop that cleans first simply receives odor and spores from the shops that have not cleaned yet.

The Solution: Disinfecting and Ozone-Treating the Whole Row With WHD

The World Health Disinfection (WHD) team recommends that shops in the same row book together, on the same day or back to back, so every shop starts from the same level of cleanliness. The process looks like this:

1. Survey the whole row. We walk through every participating shop, including the crawl space, the decks, the boat landing and the upstairs rooms, and note where walls are shared and where air passages connect.
2. Clean-up advice. Every shop discards food, ingredients and stock damaged by floodwater. Mud is cleared from the crawl space. Undamaged stock is moved out or packed into closed boxes.
3. Disinfection fogging with Chemgene HLD4H. A ULV fogger produces a fine mist that reaches the joints in timber walls, the gaps under the deck, the crawl space and the corners of upstairs rooms. CHEMGENE HLD4H disinfectant has no harsh smell and is used according to its label instructions.
4. Ozone treatment room by room or along the whole row. Doors and windows are closed as tightly as a wooden building allows, and a controlled dose of ozone helps destroy mold spores and break down the musty odor in the timber. When several connected shops are treated together, there is no risk of ozone drifting into a room where someone is still inside.
5. Ventilation. Shopfronts and rear windows are opened so the breeze off the canal flows through, until the ozone has fully broken down.
6. Re-check and advice on the timber. We check for odor the next morning and advise waiting until the wood is truly dry before painting or varnishing.

Safety: during ozone treatment there must be no people, pets or plants in the room being treated, and connected neighbouring rooms must also be empty. That is another strong reason to treat the whole row together. Food, ingredients and drinks must be taken out. Coffee machines, refrigerators and sensitive electronics should be moved out or covered. Rubber items should be removed beforehand.

How to Get Your Neighbours On Board

Coordinating several shops on the same day can sound complicated, but in Amphawa, where vendors have known each other for years, it is usually easier than people expect. Try starting with these steps:

• Talk in your row's or market's LINE group. Explain how odor is seeping between shops and suggest booking the same day.
• Pick a quiet market day. A weekday with fewer visitors lets every shop close at the same time and lose the least income.
• Send photos and a simple sketch of the row to our team. We will help plan the order of shops and the time each one needs.
• Help shops whose owners are away. In a case like Noi's, a neighbour can coordinate by phone so that shop is treated at the same time.
• Involve the market committee or municipality. Shared areas such as the canal-side walkway and public toilets need their attention.

When neighbours act together, everyone benefits: the cost of travel and set-up is shared across one visit, and nobody's work is undone by the shop next door.

It also helps to agree a few shared rules for the weeks after treatment. For example, nobody stores wet crates or sacks in the crawl space, every shop opens up to the breeze on sunny mornings, and anyone who spots a new mold patch on a shared wall posts a photo in the group the same day. These small agreements cost nothing, but they protect the investment every shop has made. They also make it far easier to decide together, quickly and calmly, whether a follow-up visit is needed before the next busy weekend.

What Each Type of Shop Should Prepare

• Dessert and snack shops. Throw out all food, flour, sugar and ingredients that touched floodwater or sat in damp air for days. Wash pots, trays and moulds thoroughly. Take every food item out before treatment.
• Coffee shops and drink stalls. Discard coffee beans, milk, syrups and cups exposed to floodwater. Have the espresso machine and grinder checked by a technician before use, and move or cover them during treatment.
• Fabric and clothing shops. Separate wet fabric from dry. Washable items should be washed and dried completely in the sun. Anything with mold stains should be set aside, not returned to the shelves.
• Souvenir and handicraft shops. Woven baskets, wooden carvings and paper goods absorb odor easily. Dry pieces without mold can stay in the room during ozone treatment to help reduce odor. Valuable antiques should be moved out or covered.
• Shops with living quarters upstairs. Mattresses and pillows that got wet should be replaced. Everyone, including pets and houseplants, must leave the building during ozone treatment.

Looking After Old Timber Without Damaging It

Amphawa's wooden shophouses are part of what makes the market special. Many are decades old, and some owners have spent years restoring them. A careful approach protects both health and heritage:

• Avoid harsh chemicals on bare wood. Bleach and strong solvents can stain, crack or weaken old timber.
• Let it dry slowly and evenly. Open the building to the breeze rather than blasting heat onto one wall, which can make planks split or warp.
• Wait before finishing. Old hardwood can take several weeks to dry through. Ask a carpenter to check moisture levels before painting or varnishing.
• Protect carved panels and antiques. Move or cover them during ozone treatment.
• Check for termites. Damp timber attracts termites. If you see mud tubes or soft spots, call a pest specialist.

Aftercare: Keeping the Musty Smell From Coming Back

Canal-side wooden houses live with moisture all year round, so what happens after the service matters as much as the treatment day. We recommend every shop in the row follows the same simple routine:

• Keep the crawl space open. Do not store crates or boxes underneath, because they block airflow and trap moisture.
• Open up in the late morning. When the sun is out, open the shopfront and rear windows at the same time to let the canal breeze through.
• Raise stock off the floor. Keep sacks, crates and folded fabric off the floor and away from timber walls.
• Wipe high-touch surfaces. Counters, door handles and customer tables can be wiped with CHEMGENE HLD4H spray.
• Photograph the old mold spots every week. Share the photos in the row's LINE group so everyone knows quickly if a new spot appears.
• Watch for mosquitoes. Tip out any containers holding water around the landing and under the floor, and consider booking mosquito spraying for the whole row if numbers rise.

When every shop follows the same routine, the canal-side walkway smells of Thai desserts, roasted coffee and the breeze off the water again, instead of floodwater.

Protecting Yourself and Your Family During the Clean-Up

Most shops along the canal are family businesses, and the clean-up crew is usually the family itself. A few simple precautions make a big difference:

• Gloves, boots and a mask. Wear rubber gloves and boots when shovelling mud from the crawl space or carrying soaked stock, and a well-fitting mask when handling anything moldy.
• Cover cuts. Put waterproof dressings on any cuts or scratches before you start. Splinters from wet timber are common.
• Bag moldy items before moving them. This keeps spores from drifting into the parts of the row that are already clean.
• Keep children and older relatives away from the crawl space and the pile of discarded stock.
• Wash and change before preparing food or going upstairs to rest.

A Simple Reopening Sequence for the Row

1. Agree a date. Pick one quiet market day for the whole row and share it in your LINE group.
2. Clear out together. In the days before, every shop removes damaged stock and food, and the crawl space is cleared of mud along its full length.
3. Treatment day. Fogging and ozone treatment are carried out shop by shop or along the whole row, with everyone out of the connected rooms.
4. Ventilate and check. Open everything up to the canal breeze, then do a smell check together the next morning.
5. Restock and reopen. Bring back dry stock, prepare fresh food in clean kitchens, and reopen as a row so visitors see a market that is ready.

Reopening together sends a strong message to visitors: the market has recovered, not just one shop.

10 Reasons Timber Shops at Amphawa Floating Market Choose WHD

1. We understand wooden rows where walls, crawl spaces and roofs are all connected.
2. We plan the whole row in one day so every shop starts from the same clean baseline.
3. Fine-mist disinfection fogging reaches the joints in timber walls and the gaps under decks.
4. Chemgene HLD4H does not stain old timber the way bleach does.
5. Ozone treatment breaks down musty odor in the wood rather than covering it with incense.
6. Clear advice on separating food and stock before work begins.
7. Controlled ozone dosing and careful attention to the safety of neighbouring rooms.
8. Scheduling that fits quiet market days.
9. Mosquito spraying for canal banks and crawl spaces with standing water.
10. Easy to reach on LINE. Send photos of the whole row for an initial assessment.

Before and After: Auntie Jit's Row

In the Customer's Words

"I had already cleaned my own shop once and the smell still came back. The team looked and said the walls are joined, so the whole row has to be done. I rang Noi and Beer and we booked the same day. They finished in the evening, and when I opened the next morning there was no musty smell. Now I can sell my desserts with peace of mind."

— Auntie Jit, Thai dessert and souvenir shop, Amphawa floating market (illustrative scenario)

Frequently Asked Questions

Q: If the shop next door will not join in, can I treat my shop alone?
A: Yes, although the results may not last as long. We pay extra attention to sealing gaps and fogging the shared wall on your side, and during ozone treatment any connected neighbouring room must be empty.

Q: Will ozone damage old teak?
A: We control the ozone dose to suit the size of the room, and treatment for an appropriate period is suitable for wooden houses. Highly valuable carvings and antiques should be moved out or covered.

Q: When can a dessert shop or coffee shop reopen after treatment?
A: Once the space has been ventilated, the ozone has fully broken down, food-contact surfaces have been rinsed with clean water and our team has re-checked it.

Q: What should I do with fabric stock that did not get wet but smells musty?
A: Washable items should be washed and dried completely in the sun. Dry stock without mold marks can stay in the room during ozone treatment to help reduce odor. Fabric with mold stains should be separated out.

Q: Do the deck and boat landing in front of the shop need treating?
A: Yes, they should be cleaned of mud and their surfaces disinfected, because customers walk on them and children often sit there. Ozone treatment, however, only works in enclosed spaces.

Q: When can I paint or varnish the timber walls?
A: When the wood is dry through, inside and out. Old hardwood can take several weeks. Ask a carpenter to check moisture levels first.

Q: The upstairs living area was not flooded. Does it need treating?
A: It should be checked, because odor and moisture from downstairs rise through the timber floor and the stairwell. If upstairs smells musty or someone in the family has allergies, we can treat it on the same day, with everyone out of the building during ozone treatment.

Q: Does one treatment solve the problem for good?
A: The treatment removes the mold and odor that are there now. Whether they come back depends on moisture. If the row keeps its crawl space open, airs the shops regularly and keeps stock off the floor, results last much longer. If old spots start to reappear, send us a photo early, because a small patch is much quicker to deal with than a large one.

Bring the Whole Row Back Together and Reopen the Market

Serving shops, wooden shophouses and canal-side homes in Amphawa, Bang Khonthi, Mueang Samut Songkhram and nearby areas.

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

Related Pages and Sources

• Residential ozone disinfection
• Ozone treatment for odors and chemical residue
• Mosquito spraying service
• All articles
• External sources: WHO: Floods and health and Thailand Department of Disease Control

#WoodenShophouseOzone #OzoneTreatment #PostFloodDisinfection #MoldRemoval #MustyOdorRemoval #Disinfectant #AmphawaFloatingMarket #HomeFloodRecovery

Keywords: ozone treatment for wooden shophouses at a floating market after a flood, canal-side shops, mold in wooden houses, shop disinfection, musty odor removal, Amphawa, Samut Songkhram 2026