The Old Leather Sofa and Second-Hand Persian Rugs That Made Foreign Buyers Sneeze and Cost an Antique Shop a 1.24 Million Baht Order and the Dust Mite Removal Service That Fixed It
Last updated: 13 Oct 2026 | 17 Views |
The Old Leather Sofa and Second-Hand Persian Rugs That Made Foreign Buyers Sneeze and Cost an Antique Shop a 1.24 Million Baht Order — and the Dust Mite Removal Service That Fixed It
It was 2:15 on the afternoon of Saturday, 14 March 2026, at Baan Kao Lao Rueang Antiques, a three-unit shophouse selling antique furniture on Charoen Krung Road in Bang Rak, Bangkok. Afternoon sun came through the old wooden louvres in stripes, and fine dust floated in those stripes the way it did every day. The owner had always believed that was part of the atmosphere customers loved.
Khun Chonticha Techawong, known as Khun Jiab, 46, stood beside a teak writing desk she had just wiped down, holding the keys to a wardrobe more than ninety years old. She had been waiting since morning for the most important buyers of the quarter: Claire Dubois, a French interior designer based in Singapore, and her assistant Henrik, from Denmark. They were designing a forty-room boutique hotel in Hua Hin and had agreed in principle to buy 46 antique pieces worth 1,240,000 baht.
That day was the final in-person inspection before the balance payment. Claire chose to sit first on a dark brown English-style leather sofa about 80 years old. She rested her hands on the arms, leaned back, and within ten minutes she was struggling to breathe comfortably.
She sneezed eleven times in a row. Her eyes grew redder by the minute until she put on sunglasses and walked out to the pavement with a fistful of tissues. In the far corner, Henrik, who had been trying an olive-green terry-cloth armchair, began scratching his wrists and neck until they were marked with red lines.
"I am so sorry, the pieces are beautiful, but we cannot accept this risk," Claire said in a hoarse voice. "Our hotel guests will sleep and sit on these every day. If I cannot tolerate them for ten minutes, what do I tell my client?"
Three days later the cancellation email for the entire lot arrived. Two more cancellations followed, from a Japanese and an Australian buyer. Within one week, about 1,865,000 baht in orders had slipped away.
What hurt most was that Khun Jiab had seen it with her own eyes: the customers did not dislike the furniture. They simply could not stay near it. And the cause was not on the handsome surface of the sofa. It was hidden inside it.
What Was Really Going On Inside 186 Pieces From 14 Old Houses
Khun Jiab opened the shop in 2016. Her business model is to buy from old homes whose owners have died or moved away. Since early 2024 she had bought the contents of 14 houses in Yaowarat, Thonburi and Samut Songkhram. Most items were hauled in as they were, rarely opened up, because she was racing both the clock and rival dealers who wanted the same things.
The shop now held 186 pieces ready for sale: 9 leather and fabric sofas, 23 second-hand Persian and hand-woven rugs, 31 armchairs upholstered in terry cloth and velvet, and 12 teak and hardwood wardrobes, plus tables, display cabinets and old wooden beds. Seven heavy velvet curtains hung permanently in front of the sitting room used for trying out furniture.
After the customers walked out, she barely slept for two nights. On the third night she did something she had never done: she opened up the sofa that had made Claire sneeze. Under the seat she found a greyish-brown lining where dust had formed a felt-like mat, foam and coconut fibre packed beneath the leather, and a long line of debris along the stitched edges. She took a dozen photos and sent them to a friend who is a nurse.
The reply was short: "That is exactly where dust mites live. If customers react, it is no surprise."
Khun Jiab began to line up the past two years, and a pattern appeared that she had overlooked all along.
- Of 41 foreign visitors in 2025, 9 sneezed or had red eyes in the shop and 5 left early.
- Two sales staff took 17 sick days in total over six months for chronic nasal congestion.
- The shop's regular wood restorer had always said, "Every cabinet I open, the dust flies, I need a mask."
- The 23 rugs had been rolled up in a windowless storeroom, some for more than 14 months.
It was all one story. Old furniture that carries decades of memory also carries other things.
Why Dust Mites Are Especially Bad in an Antique Shop
An ordinary home mixes new items with daily-use things, washes bedding weekly and has people opening and closing windows. An antique shop is the opposite in almost every way, which makes it worryingly suitable for dust mites.
1) Food stored over decades
Dust mites feed on shed human skin. A sofa sat on for eighty years is like a giant pantry restocked across generations. The longer the use, the more food has built up inside the filling, and nobody has ever washed it out.
2) Materials that hold dust and moisture
Coconut fibre, horsehair, foam, terry cloth, velvet and wool pile all absorb moisture from the air and leave gaps between fibres where mites can cling. Put them all in one shop and the surface area where dust can settle becomes enormous.
3) Transport, relocation and closed rooms
Goods from old houses travel on pickup trucks through rain and heat before landing in a shophouse whose rear has no windows. Khun Jiab measured the back storeroom with an inexpensive meter throughout February 2026 and found relative humidity between 68 and 79 percent, a range in which mites multiply well.
The Fallout Goes Beyond Sneezing: Money, Health and Reputation
1) Money lost to cancelled orders
The Hua Hin hotel order was 1,240,000 baht, the Japanese buyer's 385,000 baht and the Australian's 240,000 baht, for a total of 1,865,000 baht. A deposit of 372,000 baht had already been refunded. Against roughly 6.2 million baht in 2025 sales, nearly a third of a year's revenue disappeared in a single week.
2) A reputation built over ten years
A travel-site review read: "Beautiful things but so dusty, sneezed all day." Three similar reviews followed, and the shop's rating fell from 4.8 to 4.3 in two months. Khun Jiab noticed more tourists photographing the storefront and not coming in.
Why the Usual Antique Dealer Methods Do Not Really Work
Khun Jiab tried almost every method passed around the trade, and found that each solved half the problem, or the wrong one.
An ordinary vacuum cleaner: dust can come straight back
Bag and bin vacuums often draw in fine particles and push some of them back out through the exhaust, turning settled dust into airborne dust. Khun Jiab saw this after buying her new machine: the shop was full of floating particles in the afternoon light, more than before.
Getting to Know the Dust Mite: A Tenant Who Never Paid Rent in an 80-Year-Old Sofa
A dust mite is a tiny arthropod, only about 0.1 to 0.3 millimetres long, with eight legs, invisible to the naked eye. It does not bite or sting. The trouble comes from allergens in its droppings and body fragments. When these rise into the air as someone sits down or an item is moved, sensitised people breathe them in and react.
Dust mites and health
Dust mite allergens are linked to allergic rhinitis, conjunctivitis, eczema and itchy rashes, headaches, and may trigger asthma symptoms in people who already have asthma, as described by the World Health Organization (WHO). If symptoms are persistent, always see a doctor.
The Way Out Khun Jiab Chose: A Full-Service Dust Mite Removal Service From World Health Disinfection
On the night of Wednesday, 18 March 2026, Khun Jiab searched until late. She was not looking for a way to make antiques look cleaner. She wanted to remove what customers were reacting to without harming the pieces. She found the page for the dust mite removal, carpet, mattress and sofa cleaning service with full disinfection from World Health Disinfection, described as the first of its kind in Thailand and covering mattresses, sofas, carpets and curtains.
She called 065-556-6294 the next morning. The person on the line asked three questions: how many pieces, what materials, and which items must not get wet or be moved. A site survey was booked for Saturday, 21 March 2026.
The team arrived at 9 a.m., walked through every piece taking notes, and told her plainly that old leather sofas should not be washed with large amounts of water. The focus would be on drawing particles out of the surface, the seams and any under-seat layers that could be opened, while rugs would need a colour test every time, and antique silk rugs would only be vacuumed with suitable suction.
They pointed out four hotspots.
Point one was the foam, coconut fibre and lining under the cushions of all 9 sofas.
Point two was the 31 terry-cloth and velvet armchairs, whose high-pile fabrics held the most dust in the shop.
Point three was the 23 rugs, especially their backs and the bases that had lain on floors for years.
Point four was the floors and corners inside the 12 wooden wardrobes, with their cloth linings and drawers unopened for years.
"They did not sell me anything that day," Khun Jiab recalls. "They asked which piece I feared damaging most and planned the work starting from that one."
The Technology Behind It: SIRENA System, Water Filtration Plus HEPA
The machine the team brought was the SIRENA System, a dust mite removal machine designed in Canada and driven by a 1200 W cyclone motor from Italy. What interested Khun Jiab most was that it does not rely on a traditional dust bag.
How water filtration works
Air drawn in with dust is pulled through water in the filtration tank, so particles are trapped in the water 100 percent and do not blow back into the room. That differs from an ordinary vacuum cleaner, which is what had filled her shop with floating particles. The team opened the tank to show her after the job.
A HEPA filter down to 0.02 micron
After the water, the air passes a HEPA filter fine down to 0.02 micron, smaller than most allergen particles, so the exhaust is clean enough to work in a small, closed shop. The system removes allergens at 99.99 percent.
MASTER VACUUM for suitable washing
For rugs and fabric seats that pass the colour test, the team washes with MASTER VACUUM using a controlled amount of water. Fragile pieces or those that must stay dry are treated only with SIRENA to draw the allergens out.
10 Reasons Antique and Furniture Shops Should Choose World Health Disinfection's Dust Mite Removal Service
- The first in Thailand to offer dust mite removal, carpet, mattress and sofa cleaning with complete disinfection.
- Removes allergens at 99.99 percent, a figure you can use to answer customers and designers clearly.
- Water filtration traps dust 100 percent so nothing blows back into a shop full of fragile antiques.
- HEPA filtration down to 0.02 micron, suitable for showrooms that must reopen to visitors right away.
- A 1200 W Italian cyclone motor that pulls particles from deep inside foam, coconut fibre and rug pile.
- Certified by the Asthma Society of Canada, with TUV Rheinland and Dust Mite Proof, useful as sales information.
- Covers every piece in the shop: sofas, chairs, rugs, curtains and the insides of wardrobes.
- No dismantling of large items; the team comes to you, and curtains are done without taking them down.
- Optional disinfection spraying for viruses, bacteria and mould in the same visit.
- Useful free gifts: WELLGIENIC disinfectant wipes and CHEMGENE HLD4H disinfectant.
How the On-Site Service Works: Tuesday 24 and Wednesday 25 March 2026
The shop closed for two days. A four-person team arrived at 8:30 a.m. with two SIRENA units and began in the order planned on survey day.
Step 1: Vacuum the insides of sofas and chairs
Removable cushions were opened and the team worked along seams, armrest crevices, foam and inner linings, about 55 minutes per sofa and 18 minutes per chair.
Step 2: Vacuum rugs on both sides and the base
Every rug was turned over and vacuumed front and back, along with the floor beneath, where Khun Jiab saw a flour-like layer of fine dust about half a centimetre thick.
Step 3: Open the filter tank
After the first piece, the team showed her the water tank. It had turned cloudy grey, almost black, with fibres floating in it, and the water was changed six times over two days. Khun Jiab fell silent for a while, then asked, "So customers have been breathing this every time they sat down?"
Step 4: MASTER VACUUM washing and extra disinfection
Fourteen rugs and fabric seats that passed testing were washed with MASTER VACUUM, and the showroom and storeroom received the optional disinfection spray to reduce mould, bacteria and viruses in a high-humidity space.
Step 5: Inspection and gifts
Before leaving, the team had Khun Jiab inspect piece by piece, handed over WELLGIENIC wipes and CHEMGENE HLD4H, and advised on a maintenance schedule.
Comparison Table: Ways to Handle Dust Mites in Sofas, Rugs and Antique Furniture
Before and After at Baan Kao Lao Rueang Antiques
Before (2025 to 21 March 2026)
- 9 of 41 foreign visitors sneezed or had red eyes in the shop
- 1,865,000 baht in orders cancelled within one week
- 17 staff sick days for nasal congestion in six months
- Rugs rolled in a 68 to 79 percent humidity storeroom for up to 14 months
- About 48,400 baht spent on fixes aimed at the wrong target
- Review rating fell from 4.8 to 4.3
- Khun Jiab sneezing every afternoon and dreading opening new cabinets
After (26 March to October 2026)
- On 18 April Claire sat on the same sofa for 40 minutes without sneezing
- On 25 April the Hua Hin client reordered 38 pieces worth 986,000 baht
- No sick days for nasal congestion among sales staff in the next three months
- Khun Jiab uses photos of the cloudy filter tank to explain the work to buyers
- 12 foreign buyers asked to see the cleaning record before ordering
- Review rating back to 4.7 within four months
- A four-month maintenance cycle became shop policy
Common Myths About Dust Mites in Antiques
"Genuine leather has no dust mites"
The hide itself is not the main habitat, but mites live on the dust and skin flakes that collect in seams, foam, coconut fibre and inner linings, which every old leather sofa has.
"A second-hand rug that has been washed must be clean"
Surface washing may lift stains, but allergens clinging to the base and lower fibres remain unless they are drawn out, and a rug that does not dry fully can invite mould.
"The customer is just weak, it is not our stock"
Sensitivity differs from person to person, but if someone can react, allergens are present. Reducing them is something a shop can control.
Voices From Real Customers
"I have sold antiques for ten years and always thought dust was part of the shop's charm, until the day a customer sneezed so hard she had to walk out. At first I was furious with myself for not knowing. The team came for two days, opened the filter tank to show me, and I understood at once. What mattered most is that they did not damage a single piece. Later Claire sat on the same sofa again. I was happier about that than about winning the order."
— Khun Chonticha Techawong (Khun Jiab), owner of Baan Kao Lao Rueang Antiques, Charoen Krung Road
The Conclusion of Khun Jiab's Story: From a Shop That Lost an Order to One Where Customers Dare to Sit
On the morning of Saturday, 18 April 2026, Claire Dubois came back to the shop after flying in from Singapore. She walked straight to the same dark brown leather sofa, sat down, and stayed there for 40 minutes while she and Khun Jiab talked through contracts.
She did not sneeze once.
"I really wondered what had happened," Claire asked. Khun Jiab told her everything and showed her the photo of the cloudy filter tank. Claire asked for the service details to be sent to her team in Singapore, and on 25 April she placed a new order for 38 pieces worth 986,000 baht, with one extra condition: every piece must be treated for dust mites before delivery.
Baan Kao Lao Rueang Antiques now has three new rules. Every lot from an old house is treated before it goes into the showroom. The shop is maintained every four months. And service documentation goes with every piece shipped to a hotel client.
"Antiques sell memories," Khun Jiab concludes. "But customers should never have to trade their health for someone else's memories."
All in One Visit, Plus Free WELLGIENIC and CHEMGENE
Beyond dust mite removal and MASTER VACUUM washing, World Health Disinfection offers optional disinfection spraying against viruses, bacteria and mould, so a shop with both a damp storeroom and a showroom can finish everything in one round. See the disinfection service for details.
After the service, customers receive two gifts: WELLGIENIC disinfectant wipes, which kill 99.99 percent of germs, for wiping hands and frequently touched points while customers test seating, and CHEMGENE HLD4H disinfectant spray, which kills 99.85 percent within 1 minute and protects for up to 14 days.
Do Not Let the Next Order Slip Away Because of Dust Mites in Your Antiques
Talk to the World Health Disinfection team for a free consultation, an assessment of your space, a plan matched to each material, and on-site service.
See the service details and pricing here
Call now: 065-556-6294
LINE: @whd268
World Health Disinfection Co., Ltd.
88/268 Kanlapaphruek Road, Bang Khae, Bang Khae District, Bangkok 10160
Frequently Asked Questions About Dust Mite Removal in Antique Shops
My old leather sofa cannot be washed with water. Can I still use a dust mite removal service?
Yes. The team assesses materials first. For old leather and polished wood they usually draw allergens from the surface, seams and any inner layers that open, using SIRENA System without large amounts of water. Rugs and fabric seats get a colour test before washing with MASTER VACUUM.
Can second-hand Persian rugs and antique silk rugs be treated?
Yes, as each piece allows. The team checks fibre and colourfastness first. Fragile rugs are vacuumed on both sides and on the base with suitable suction, without risking heavy wetting.
Do old wardrobes and drawers need to be dismantled?
No. The team opens the wardrobes and drawers and vacuums corners, cloth linings and floors with attachments suited to old wood, then wipes the surface with a damp cloth where appropriate.
How often should an antique shop use the service?
For shops that regularly take in goods from old houses, treat each large lot before it goes into the showroom and set a maintenance cycle of about every 4 months. Homes with allergy or asthma sufferers are advised every 4 to 6 months. The team assesses the real space.
Does dust mite removal cure allergies?
The service reduces allergens in the environment, so it can be part of care that lowers exposure to a trigger, but it is not a medical treatment. If you have persistent symptoms, please see a doctor.
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