A Story from the Field: The Smell Nida Didn't Want Her Customers to Notice

Nida owns a mid-sized garment factory in Bang Bo district, Samut Prakan province. Her team sews T-shirts, polo shirts and corporate uniforms for clothing brands and companies around Bangkok. Behind the sewing hall stands a warehouse that holds rolls of greige fabric, dyed fabric and boxes of finished garments waiting to ship. The area is crisscrossed by canals that lead out to the sea, and every year, when high tides coincide with heavy rain, the canal water rises to worrying levels. This year was worse than any she could remember.

Water flowed into the factory to a depth of about thirty centimeters and stayed for nearly ten days. The team managed to lift most of the fabric rolls and garment boxes off the floor and onto racks, but humidity inside the closed warehouse stayed extremely high the entire time the water sat there. Fans could not run, the air conditioning was off, and the building simply stewed in damp, warm air.

When the water receded, Nida opened the warehouse and caught the kind of damp, musty smell that anyone who works with textiles recognizes as a warning sign. Cotton rolls on the lowest shelves had small black mold spots along their edges. Some of the cardboard cartons holding finished shirts had gone soft and were starting to collapse. Even garments in boxes that had never touched the water had picked up a stale, musty odor that clung to the fabric when she held a shirt up to her face.

What made her anxious was a large uniform order due to a corporate customer later that month. The buyer had told her plainly in the past: if they open a box and smell mustiness or see a mold spot, the whole lot goes back. Nida needed two things urgently. First, a warehouse clean enough to hold the new production run without contaminating it. Second, a way to deal with musty odor that would not damage the fabric itself.

Across Samut Prakan, Pathum Thani, Ayutthaya and Chachoengsao, many textile mills, garment makers, uniform suppliers and clothing wholesalers are facing similar problems this October. This article explains why fabric storage is so vulnerable after a flood, why the usual remedies often backfire with textiles, and how ozone treatment combined with disinfection fogging can restore a warehouse safely.

Why Fabric Warehouses Are Riskier After a Flood Than You Might Think

Fabric absorbs moisture and odors extremely well, especially cotton, linen and blends containing natural fibers. When humidity stays high for several days, mold begins to grow on fabric, cardboard, walls and wooden pallets, even if the goods themselves never sat in floodwater. A warehouse does not need to be underwater to be damaged; it only needs to stay damp for long enough.

Health risks for employees

• Mold spores and fabric dust. Textile factories already have fiber dust in the air. Add mold spores and employees with allergies or asthma can quickly develop symptoms such as sneezing, itchy eyes, coughing and wheezing.
• Flood-borne germs. Mud and dirty water entering the factory may carry E. coli and other organisms that cause diarrhea or skin infections, especially if workers handle wet goods without gloves.
• Leptospirosis. Staff who waded through water to move goods without rubber boots are at risk, particularly if they had cuts on their feet or legs. Fever and muscle pain in the days or weeks after the flood should be taken seriously.

Business risks

In the garment trade, smell is quality. A shirt with even a faint musty odor can cause a customer to reject an entire lot, even if there is nothing else wrong with it. Mold spots on light-colored fabric are often impossible to remove, forcing discounts or write-offs. Brands that outsource production frequently inspect their suppliers' factories and warehouses too. If an auditor or a buyer's representative sees mold stains or smells mustiness during a visit, confidence in future orders drops, and it may be hard to win back.

There is also the question of customer experience further down the chain. A consumer who unpacks a new uniform or T-shirt and smells mildew does not blame the factory; they blame the brand. Brands know this, which is why they are quick to push the problem back up to the supplier.

Time pressure

Orders have deadlines. If stock has to be re-sorted several times because the odor keeps coming back, or goods must be moved to rented storage while waiting for the warehouse to dry, time and transport costs climb quickly. Meanwhile, sewing lines may be idle because the materials they need are stuck in a warehouse that nobody wants to use.

Understanding Mold on Fabric: Why Some Rolls Go Moldy Faster

Many warehouse owners notice that within the same building, some fabrics go moldy very quickly while others seem almost untouched. The difference lies in the fibers and in how the fabric has been finished.

• Natural-fiber fabrics such as cotton, linen and rayon absorb a lot of moisture and contain cellulose, which molds can feed on. These are usually the first to show spots.
• Fabrics with sizing or finishing agents can grow mold faster, because some of these treatments provide extra nutrients for fungi.
• Synthetic fabrics such as polyester absorb less moisture, but they still trap musty odors, and mold can grow on dust or residues sitting on the fabric surface.
• Tightly wound rolls release moisture slowly. If damp air has penetrated the roll, mold can start on the inner layers where it cannot be seen from outside, only to be discovered when the roll is cut.

For this reason, restoring a fabric warehouse after a flood means paying attention both to the warehouse environment and to careful sorting of stock. Simply making the room look dry is not enough. The building, the air, the racks and the goods all need to be considered together.

Why the Usual Remedies Don't Work Well in Fabric Storage

• Spraying air freshener. Fragrance mixes with mustiness to create a strange odor that clings to fabric. It does nothing about the mold causing the smell, and many buyers specifically dislike scented garments.
• Using bleach. Bleach can fade and blotch colored fabrics and is unsuitable anywhere near stock. Its own strong smell can also be absorbed by textiles.
• Running fans. Fans speed up drying, but they also blow mold spores from walls and pallets onto fabric rolls that were still in good condition.
• Painting over walls. Mold under the paint returns while humidity remains high, and the musty smell stays.
• Relying only on desiccants. Moisture absorbers help in small spaces but are not enough for a large warehouse, and they do not remove spores that are already present.

The underlying problem is that musty odor and mold are in the air, on the walls, on the pallets and inside materials. You need a method that reaches every part of the warehouse, not just the surfaces you can see and wipe.

The Solution: Ozone Treatment Plus Chemgene HLD4H Disinfection Fogging by World Health Disinfection

World Health Disinfection (WHD) provides ozone shock treatment. Ozone is a gas that spreads throughout the warehouse, reaching gaps between racks, the roof structure and every part of the air. It helps deal with mold spores and breaks down the molecules that cause musty odors. This is combined with our disinfection fogging service using Chemgene HLD4H, a high-level disinfectant applied through ULV foggers to floors, walls, racks and pallets in areas that have been cleared of stock.

Our step-by-step process for textile factories and fabric warehouses

1. Site survey. Our team inspects the warehouse, sewing lines, fabric store and packing area, assessing mold levels, where water pooled and the types of fabric being stored.
2. Sorting and clean-up advice. We advise on separating stock that was soaked or heavily moldy, discarding wet cartons and rotten pallets, and washing mud from the floor.
3. Chemgene HLD4H fogging. We fog floors, walls, racks and pallets in zones that have been cleared. We do not fog directly onto goods intended for sale.
4. Ozone shock treatment. The warehouse is sealed and the ozone generators run at a dose and duration suited to the space, targeting airborne spores and odors trapped in the building structure.
5. Ventilation. Doors and extraction fans are opened until ozone falls to a safe level before staff re-enter.
6. Re-check. We check odor and visible mold with the owner and advise on storing fabric away from walls and floors to prevent future mold.

Why fogging and ozone work better together

A flooded fabric warehouse has two layers of contamination. On the surfaces there is mud residue, bacteria from floodwater and visible mold on walls, racks and pallets. In the air and building volume there are floating spores and odor molecules soaked into insulation, ceilings and timber. Fogging addresses the first layer, ozone addresses the second. Treating only one is why musty smells so often seem to return a week or two after a quick clean-up.

Timing matters too. The best results come when the warehouse has been emptied of damaged goods, the mud has been washed out and the building has had a chance to start drying. Treating a room that is still full of wet cartons and soaked fabric means the source of the odor is still sitting there. Our survey helps you decide what needs to happen first, so the treatment day delivers the biggest possible improvement and you are not paying for work that has to be repeated.

10 Reasons Textile Factories in Bang Bo Choose WHD

1. Odor is tackled at the source. Ozone treatment breaks down odor molecules instead of covering them with fragrance.
2. Fewer airborne spores, reducing the chance that mold settles on fabric rolls and new stock.
3. Reaches the gaps between racks. Both ozone and ULV mist get into places hand-wiping misses.
4. We use Chemgene HLD4H, a high-level disinfectant with broad activity against bacteria, viruses and fungi.
5. Controlled ozone dose, with attention to dyes and elastic in your products.
6. Helps you meet delivery dates. We work zone by zone so part of the warehouse can be used again sooner.
7. Safe for staff, with clear closure and ventilation procedures.
8. Machines and electronics protected. Sensitive equipment is covered or removed before treatment.
9. Whole-factory coverage, including warehouse, production lines, staff rooms and offices, plus our dust mite removal service for upholstered and fabric areas.
10. Easy to contact. Call 065-556-6294 or message LINE @whd268.

Before and After Ozone Treatment and Disinfection Fogging

A Practical Guide to Sorting Flood-Affected Stock

One of the hardest parts of recovering a fabric warehouse is deciding what to keep. Owners understandably want to save as much stock as possible, but keeping the wrong items can contaminate everything else and put customer relationships at risk. A simple, consistent sorting system makes the decisions faster and easier to defend.

Group 1: Goods that were soaked in floodwater

Anything that sat in floodwater has been exposed to mud, sewage and whatever else the water carried. These goods should never be shipped as they are. Depending on the fabric and its value, they may be laundered to an appropriate standard and re-inspected, sold as seconds after proper cleaning, or discarded. Keep them physically separate from all other stock, ideally in a different room, so that moisture and spores do not spread.

Group 2: Goods with visible mold

Mold spots on fabric, especially light-colored cotton, are often permanent. Even after washing, faint stains may remain and the fabric fibers can be weakened. Assess these items one by one. Lower-value items are usually best discarded. Higher-value rolls may be partly salvageable if mold is limited to the outer layers, but inner layers should be checked carefully before any decision is made. Moldy goods should leave the warehouse before ozone and fogging, otherwise they continue releasing spores into the clean space.

Group 3: Goods that only smell musty

Items that stayed dry but absorbed a musty odor from the air are the most likely to be saved. Once the warehouse itself has been treated and ventilated, many of these items lose their odor gradually in clean, dry air. For stubborn odors, controlled ozone exposure may help, but always test a sample first to check that dyes, prints and elastic are not affected. Never seal musty items into new packaging until the odor has gone, because the smell will concentrate inside the box.

Keep a simple record

Write down what was sorted into each group, what was done with it and when. A simple spreadsheet or even a notebook is enough. If a buyer later asks how flood-affected stock was handled, you will have a clear answer, and the record will also help with any insurance claim.

Long-Term Storage Habits That Keep Mold Away

Bang Bo and much of Samut Prakan sit low and close to the sea, so humidity will always be a challenge. A few simple habits make a big difference over the long term:

• Keep stock off the floor and away from walls. A gap of at least a hand's width lets air circulate and stops moisture wicking from concrete into fabric.
• Use plastic pallets where possible. Wooden pallets absorb water and can harbor mold for months after a flood.
• Rotate stock. Fabric that sits untouched in a corner for a long time is more likely to develop problems.
• Watch the roof and drains. Small leaks during the rainy season are a common, overlooked cause of mold in fabric stores.
• Plan regular ozone treatment for an empty or partially emptied warehouse between peak seasons, especially after long spells of wet weather.

In Her Words: A Factory Owner's Perspective

"The smell was my biggest fear, because the moment a customer opens a box and smells mildew, it's over. The team helped us separate the damaged goods, fogged the racks and floor, then ran ozone through the whole warehouse. They warned us about dye colors too, so we moved the finished stock out first. When we opened the warehouse again, it smelled completely different, and we could store the new run with a lot more confidence."

— Nida, garment factory owner, Bang Bo, Samut Prakan (field scenario)

Checklist for Restoring a Fabric Warehouse After the Flood

• Sort stock into three groups: soaked, moldy, and merely musty-smelling. Decide clearly how each group will be handled.
• Do not sell soaked goods as they are. Products that sat in floodwater should be laundered to an appropriate standard or discarded, because floodwater carries germs and contaminants.
• Discard wet cartons and rotten wooden pallets. They hold moisture and spores and will re-contaminate the clean space.
• Wash and disinfect floors, walls and racks.
• Use ozone to deal with airborne spores and musty odor, followed by thorough ventilation.
• Store fabric on racks away from walls and off the floor, and use moisture-resistant packaging where possible.
• Monitor humidity regularly and catch musty smells early, before mold becomes visible.
• Check electrics. Have technicians inspect electrical systems and sewing machines before restarting.
• Protect workers. Anyone wading through water should wear boots and gloves, and see a doctor promptly if they develop fever or muscle pain.
• Talk to your buyers. A short, honest update about how you have restored storage can reassure customers and protect the relationship.

Frequently Asked Questions (FAQ)

Q: Will ozone fade our fabrics?
A: High concentrations of ozone can fade some dyes. We control dose and time, and recommend moving high-value goods out or testing a sample first.

Q: Can garments that were soaked in floodwater be sold after ozone treatment?
A: We do not recommend it. Goods that sat in floodwater should be laundered to an appropriate standard or discarded, because floodwater contains germs and contaminants.

Q: Do you spray disinfectant onto fabric rolls?
A: No. We fog floors, walls, racks and pallets in areas that have been cleared, not goods intended for sale.

Q: Will our computerized sewing machines be affected?
A: Sensitive electronics are covered or removed before treatment, and the ozone dose is controlled to suit the space.

Q: How long will we need to stop work?
A: It depends on the size of the site. We can work zone by zone or outside working hours by arrangement. Call 065-556-6294 to discuss.

Q: Can staff rooms and offices that also flooded be done at the same time?
A: Yes. We plan all areas together so mold from other rooms does not drift back into the clean warehouse.

Don't Let a Musty Smell Ruin Your Orders

Restore your fabric warehouse to a clean, fresh state, ready for new stock. Talk to the World Health Disinfection team today.

Book Ozone Treatment – Click Here

See Our Disinfection Service – Click Here

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

Related Links

• Ozone treatment for odor and chemical residue removal
• Master Ozone Generator
• Dust mite removal service
• All articles from WHD
• External sources: WHO – Floods and health and Department of Health, Thailand