A story from the field: a month of bookings, and a studio that still smells of floodwater

M, a thirty-eight-year-old tattoo artist, has run his studio on the ground floor of a shophouse in Bangkok's Huai Khwang district for almost eight years. It is a small place: two tattoo beds, a waiting area, a drawing corner and a storeroom at the back. His regulars include office workers from along Ratchadaphisek Road and international visitors who book through social media.

During the 2026 floods, water from the street poured in about thirty centimeters deep and stayed for two days. M managed to lift his machines, inks and boxes of needles onto high shelves in time, but the low storage cabinets, the curtain that divided the room, the waiting-area sofa and part of the laminate floor all went under. When the water receded, there was a muddy line along the base of every wall, a damp, musty smell hung throughout the studio, and spots of mold had begun to appear on the cabinet edges and the back of the sofa.

With a full month of postponed appointments waiting, M wanted to reopen as soon as possible. Yet he knew very well that tattooing breaks the skin. Clients expect the same standard of cleanliness they would find at a clinic, and a musty smell when they walk through the door could be enough to make someone uneasy and cancel.

Studio hygiene has two layers, and they must be kept clearly apart

The most important thing to understand first is that cleanliness in a tattoo studio has two separate parts. The first is everything that touches skin and blood: needles, tips, grips, ink caps and any reusable tools. This layer stays entirely with the artist, who must follow the studio's existing professional standards at every step, including single-use supplies, proper cleaning, sterilization in the autoclave the studio already uses, and compliance with the requirements of the relevant authorities.

The second part is the studio environment: floors, walls, cabinets, beds, the waiting area, the restroom and the air inside the shop. This is the part that a flood damages most, and it is where disinfection fogging and ozone treatment can help.

Fogging and ozone treatment never replace the standard sterilization of tattoo instruments. What they do is restore the space around the artist's workstation so that it is clean, free of musty odor and free of built-up mold. Both layers have to be done together to give clients a studio they can trust.

Risks a tattoo studio should know about after the water recedes

The health of clients and artists

Urban floodwater can be contaminated with sewage from drains. It may carry E. coli, which is associated with diarrhea, and Leptospira bacteria, which cause leptospirosis, known in Thailand as rat urine fever. Mold spores in the studio can trigger allergies and asthma in clients who sit or lie still for hours during a session, and the artists, who work close to clients' skin all day, breathe the studio air the entire time.

Anything the water touched must be discarded

Tattoo ink, needles, tips, gloves, wound film, gauze and any other single-use items that were reached by floodwater, or that sat in boxes that became damp, should all be thrown away, even if the outer packaging still looks sealed. There is no way to be sure that water did not get in. Autoclaves, tattoo machines and other electrical equipment that were exposed to water or heavy humidity should be checked by a technician or the manufacturer's agent before use.

Reviews and reputation

A tattoo studio lives on trust. Many clients choose a studio from reviews and photos on social media. If a client writes that the studio smelled musty or that they saw mold in a corner, the damage could cost more than the repairs themselves.

Why the usual methods are not enough

• Wiping surfaces with alcohol alone: useful on surfaces that are already clean, but it does not reach behind cabinets, under tattoo beds or into the gaps of a laminate floor, and it does nothing for musty odor inside walls.
• Pouring strong bleach: the harsh smell lingers in a small room, stings the noses of clients and artists, and can make the faux-leather upholstery of tattoo beds deteriorate faster.
• Running an air purifier or burning scented candles: this helps the air a little, but the source of the smell stays in the sofa, the curtains and the walls.
• Laying new flooring over an old floor that is still damp: moisture trapped underneath lets mold grow and the smell returns within weeks.
• Keeping ink and needles that "look like they stayed dry": the risk is simply not worth it. Discard them and reorder.

Preparing the studio before the team arrives

1. Discard any single-use items exposed to water: inks, needles, tips, gloves, gauze and film stored where the water reached or in damp boxes.
2. Remove tattoo machines and electrical equipment: machines, power supplies, drawing tablets and the autoclave should be stored separately in a dry place and sent for inspection if they got wet.
3. Take down curtains, seat covers and drapes: wash them in hot water and dry them completely. Anything heavily moldy should be thrown away.
4. Assess the sofa and other upholstered furniture: pieces that were submerged usually hold contaminated water deep inside and should be considered for disposal.
5. Wash away the mud and wipe surfaces: clean floors, the base of walls and cabinets with an ordinary cleaner, then open up the studio to ventilate.
6. Have an electrician check the wiring: all low sockets, plugs and cables should be inspected before the lights and air conditioning are switched on.

The solution: disinfection fogging plus ozone treatment by World Health Disinfection

Our disinfection service uses CHEMGENE HLD4H, applied as an ultra-low-volume (ULV) mist throughout the studio: the tattoo room, the waiting area, the restroom and the storeroom. The fine droplets reach under tattoo beds, behind cabinets, into floor joints and up into the corners of walls that a cloth cannot reach.

Our ozone treatment service is well suited to a shophouse studio that can be closed up completely. Ozone helps reduce airborne mold spores and breaks down the odor molecules trapped in walls, ceilings and any remaining furniture, so the studio smells fresh again before clients return.

How the work is done

1. Survey the studio: with the owner, we check how high the water came, where the damp spots and mold are, and what materials the studio is built and furnished with.
2. Advise on preparation: we confirm that tattoo equipment, inks and electronics have been removed or covered.
3. Disinfection fogging: ULV application of CHEMGENE HLD4H across the whole studio.
4. Ozone shock treatment: the studio is closed and treated while nobody is inside.
5. Ventilation: doors and ventilation are opened until the team confirms the space is safe.
6. Re-check: we check odor and damp spots again and give advice for the first week after reopening.

After that, the artist sets up each workstation following the studio's usual standard procedure: wiping down surfaces, covering equipment with barrier film or sleeves, and using only instruments that have been properly sterilized.

Ozone safety during treatment

• No people, pets or plants may be inside during ozone treatment. If the studio has a resident cat or dog, it must be taken out first.
• Tattoo inks, aftercare creams and retail products should be removed from the studio or sealed in closed boxes.
• Tattoo machines, rubber grips, cables and electronics should be removed or covered, because high concentrations of ozone can make some rubbers and plastics deteriorate faster. The team controls the ozone dose and duration.
• Valuable artwork, paintings and framed flash sheets on the walls should be taken down and stored beforehand.
• After treatment, the studio is ventilated until the team confirms it is safe to go back in.

The first week after reopening: what to keep doing

Ground-floor shophouse studios often hold moisture in their walls longer than people expect. During the first week after reopening, run the air conditioning or a dehumidifier regularly, and keep an eye on corners, the backs of cabinets and the lower edges of walls for new mold spots or a returning musty smell. If you find any, let the team know so they can re-check.

An air conditioner that was exposed to humidity and mud should have its coil and drain tray cleaned by a technician before it is run at full capacity. The client restroom should have its drains flushed and checked for odor coming back up, because clients often use the restroom just before a long session begins.

Communicating with clients matters too. The studio can post an update explaining how the premises were cleaned after the flood and confirming that instrument sterilization continues under the same standards as before. Straightforward messages like this help clients book again with peace of mind.

Waste from the clear-out also needs care. Used needles and sharps, or any that were exposed to floodwater, belong in a sharps container and should go through the infectious-waste channel the studio already uses, not into the general rubbish piled outside shophouses after the water recedes, where they could injure waste collectors and neighbors. Spoiled inks and creams should be bagged and sealed before disposal.

A simple timeline from flood to first client

Every studio is different, but most owners find it helps to think of the recovery in clear stages rather than trying to do everything at once.

Stage one: make it safe and dry

As soon as the water has gone, switch off the power at the main breaker until an electrician has checked the low sockets. Shovel and wash out the mud, open the front shutter and any back door to let air through, and move anything wet out of the studio. Photograph the damage for insurance or landlord records before you throw things away.

Stage two: sort and discard

Go through every box of supplies. Separate anything that was touched by water or sat in damp packaging, and discard it. Make a list of what needs reordering, so new stock can arrive while the premises are being treated. Send the autoclave and machines for inspection if there is any doubt about them.

Stage three: treat the premises

Once the studio is empty and the heavy mud is gone, book the disinfection fogging and ozone treatment, ideally outside normal opening hours. After ventilation and the team's re-check, the space is ready for the studio's own set-up routine.

Stage four: set up and reopen

Set up each station following your standard procedure, run a test day with the air conditioning on to make sure no smell returns, and then welcome back your first clients.

Why ground-floor shophouse studios are especially vulnerable

Many of Bangkok's tattoo studios, like M's, occupy the ground floor of an older shophouse. These buildings have their own weak points after a flood. The floor often sits only slightly above street level, so water arrives quickly and drains slowly. Walls are usually brick and plaster, which soak up water like a sponge and release it slowly over weeks. The back of the unit often has little natural ventilation, and the storeroom or restroom may have no window at all. Shared walls mean that moisture and odor can also come through from a neighboring unit that has not been cleaned yet.

Studios also tend to be fitted out with materials that trap moisture: decorative wall panels, fabric curtains between stations, upholstered waiting-area furniture, carpet tiles or laminate flooring. Each of these can hide damp and mold behind a surface that looks dry. That is why the survey before treatment matters. It helps the owner decide which fittings can be cleaned and kept, which need to come out, and where the treatment should focus.

Finally, a shophouse studio is usually a closed, air-conditioned space during working hours, which is good for client comfort but means that any musty smell has nowhere to go. Treating the space thoroughly once, rather than masking the smell day after day, saves effort and protects the studio's reputation.

Questions your clients may ask, and honest answers

Clients who know the area flooded may have questions when they arrive for their first session after reopening. Being ready with clear, honest answers builds trust.

"Did the studio flood?" Yes, and it is better to say so. Explain how high the water came, that all supplies exposed to water were discarded, and that the premises were professionally disinfected and ozone-treated before reopening.

"Are the needles and equipment safe?" Explain that instrument hygiene has not changed: single-use needles and supplies are opened in front of the client, and reusable tools are sterilized under the same standards as always. The flood clean-up concerned the room, not the instruments.

"Why does it smell different?" A newly treated studio may simply smell clean and neutral, without the scented products some clients are used to. If a client notices anything unusual, take it seriously and let the team re-check.

Transparency like this tends to reassure clients far more than silence. Many will appreciate knowing that the studio took the extra step.

Everyday habits that keep the studio fresh after treatment

A professional treatment gives the studio a clean starting point, and good daily habits keep it that way. At the end of each day, wipe down the floor around each station, the waiting-area seating and the door handles, and empty the bins so nothing sits overnight in a warm room. Keep the storeroom tidy, with supplies on shelves raised off the floor and away from the walls, so air can move behind them. Check the drain tray of the air conditioner and the restroom floor drain once a week for standing water or a sour smell.

It also helps to keep a simple log for the first month: the date, whether any smell was noticed when opening up in the morning, and whether any new spots appeared on walls or furniture. If the log shows a pattern, such as a smell that returns after heavy rain, it points to a specific source of moisture that can be fixed. These small routines take only a few minutes, yet they protect both the investment in the clean-up and the trust of every client who walks through the door.

10 reasons tattoo studios in Huai Khwang choose WHD

1. Clearly separated roles: WHD treats the studio premises, while tattoo instruments stay under the artist's existing sterilization standards.
2. ULV disinfection fogging reaches under tattoo beds, behind cabinets and into floor joints.
3. We use CHEMGENE HLD4H, a disinfectant used in professional settings.
4. Ozone treatment reduces musty odor and airborne mold spores in shophouse studios.
5. Our ozone generators allow a controlled dose, suitable for studios with electronic equipment.
6. We work outside opening hours, so booked appointments are not affected.
7. Our preparation checklist helps make sure no water-exposed single-use supplies are overlooked.
8. We advise on care during the first week and re-check if the smell returns.
9. CHEMGENE 750 ml spray is available for wiping general studio surfaces during the day.
10. Easy contact by phone and LINE, serving Huai Khwang, Din Daeng and nearby areas.

Before and after restoring the studio

A client's voice (example scenario)

"I already sterilize my equipment the way I always have. What worried me was the studio itself after the flood. The team explained clearly that they look after the premises, and my instruments still follow the same standards as before. They gave me a checklist of what to throw away, came while the studio was closed, fogged the whole place and then ran the ozone. After ventilation, the musty smell that used to hit you when you opened the door was mostly gone. My first clients back did not mention any smell at all."

— M, owner of a tattoo studio in Huai Khwang (example scenario from the field)

Frequently asked questions

Q: Can fogging replace autoclave sterilization of tattoo instruments?
A: No. Fogging and ozone treatment look after the studio space and air. Anything that touches skin or blood must be sterilized, or single-use, under the existing professional standards every time.

Q: My ink bottles are still sealed, but the box got wet. Can I keep using them?
A: We recommend discarding them, because there is no way to confirm floodwater did not get in. The risk to clients is not worth the cost of the ink.

Q: How long does the studio need to close?
A: It depends on the size of the studio and how strong the odor is. The team usually works outside opening hours and tells you exactly when you can go back in.

Q: Will ozone damage my tattoo machines or rubber grips?
A: We recommend removing or covering them first. The team controls the ozone dose and duration to limit any effect on rubber, plastics and electronics.

Q: Can a faux-leather tattoo bed that got wet be used again?
A: If water did not soak into the foam inside and the surface is not cracked, it can be cleaned and reused. If the foam absorbed water or smells, the cushion should be replaced.

Q: Which areas do you serve?
A: Huai Khwang, Din Daeng, Chatuchak, Wang Thonglang and nearby areas. Ask us on LINE @whd268.

Reopen your studio in a space that is clean and free of musty odor

Book a survey of your tattoo studio in Huai Khwang or nearby. We can work outside your opening hours.

See our disinfection service

Book ozone treatment

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

Related links

• Ozone treatment for odors and chemical residue
• CHEMGENE HLD4H disinfectant spray
• Master Ozone Generator
• All articles
• External sources: WHO: Floods and health and the Thai Department of Health