A typical scenario (an illustrative situation, not the story of any specific organisation or person)

The fourth night of rowing, and a pile of life jackets nobody wants to touch

It is two in the morning on 27 September, and a small volunteer rescue base in eastern Bangkok still has every light on. Ek, the 45-year-old team leader, sits leaning against the wheel of a pickup truck still caked in mud up to the wheel arch. For four days he and eight teammates have been paddling flat-bottomed boats in and out of flooded lanes around Bueng Kum, bringing elderly residents trapped in single-storey houses, small children and bedridden patients out to the pick-up point. On many trips they had to wade waist-deep, dragging the boat past spots where power cables hung low.

In one corner of the car park, orange life jackets are piled almost knee-high. Every one is soaked in murky water; some have leaves and black grime stuck in the straps. Next to them lie two field stretchers, a spine board, throw ropes, discarded rubber gloves and three two-way radios on a folding table. The smell drifting from the pile is a mix of sewage, engine oil and the sour odour of fabric that has stayed wet too long.

Ball, a 22-year-old volunteer, walks over to say that the graze on his shin, cut on a fence yesterday, has turned red, swollen and hot. Ek sends him to a doctor immediately. But a question hangs in the air: in five hours the morning shift arrives. They will put on these same life jackets, use this same stretcher to lift an 80-year-old grandmother from the next house, and sit in the same cab where everyone has gripped the steering wheel, door handles and radio microphone with hands that were just in floodwater.

"Isn't a hose-down enough?" someone asks. Ek shakes his head. He remembers from the great flood of 2011 that gear rinsed with plain water and left to dry in the shade usually starts to smell again within two days, and nobody really knows what remains on surfaces you cannot see. This guide is written for teams like Ek's: people who have spent days caring for others and now need to keep their equipment and teammates safe too.

What happened in Bangkok in late September 2026

According to news reports, continuous heavy rain of around 300 mm fell on Bangkok in roughly 48 hours between 24 and 27 September 2026, flooding large parts of the city. On 26 September the Bangkok Metropolitan Administration declared all 50 districts a disaster zone. Eastern Bangkok was hit hardest, with areas such as Khlong Chan and Bueng Kum mentioned in coverage. Governor Chadchart Sittipunt said the canals were full and that drainage would take two to three days after the rain stopped. Reports also described tragic loss of life, a sober reminder that urban flood rescue carries serious electrical and water hazards.

As of 30 September, some roads such as 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.

For volunteers and rescue staff, those numbers translate into days of continuous work, the same equipment cycled between dozens or hundreds of evacuees, and going home to family every night in boots and clothes that have been in floodwater all day. The period when the water starts to recede is the most important moment to "reset" every piece of gear before it goes back into storage or is sent to another area.

What comes back on rescue gear: the invisible hazards of urban floodwater

Floodwater in a big city like Bangkok is not clean rainwater. When canals fill and drains overflow, rain mixes with septic tank overflow, wastewater, rubbish, animal carcasses, rat urine and fuel from submerged vehicles. Every time a boat moves through it, a rope is thrown into it or a stretcher is laid on a wet floor, the equipment is coated with a thin film of this mixture. When it dries, what remains is mud and organic residue, an ideal home for microorganisms.

Germs every rescue team should know

• Leptospirosis. Leptospira bacteria come from the urine of rats and other animals and enter the body through cuts, grazes, waterlogged skin, eyes and mouth. Watch for sudden high fever, headache, muscle pain especially in the calves, and red eyes. Anyone with these symptoms after wading must see a doctor quickly and mention the flood exposure.
• Gut bacteria such as E. coli and Salmonella from sewage. They travel on hands that touch equipment and then food or water, causing diarrhoea, cramps and vomiting, all very common after floods.
• Norovirus. Extremely contagious via contaminated surfaces and fast-spreading in shelters and crowded vehicle cabins.
• Respiratory viruses including influenza, RSV and COVID-19. When many evacuees share one vehicle or shelter, these settle on grab rails, seats, seat belts and radio microphones.
• Hand, foot and mouth disease, common in young children. Child-size life jackets and vehicle seats can pass it on.
• Skin infections. Small wounds exposed to dirty water can become red, swollen or infected, as in Ball's case.
• Mold. Life jackets, ropes, fabric gloves, boots and seats that stay damp for more than a day or two breed mold, causing musty odours and possibly triggering allergies or asthma.

Who is most at risk

First, the volunteers themselves, especially anyone with wounds, those short of sleep after long shifts, and people with conditions such as diabetes that slow healing. Second, the evacuees: elderly people, bedridden patients, young children, pregnant women and anyone with chronic illness or weak immunity. They touch stretchers, seats and life jackets directly and are less able to fight infection. Third, and often forgotten, are volunteers' families at home, because germs travel back every night on boots, bags and clothing.

Sort gear into four groups

Hard, non-porous surfaces such as aluminium or fibreglass hulls, paddles, helmets, stretchers, spine boards and plastic buckets are relatively straightforward to clean and disinfect. Soft or porous materials such as life jackets, straps, ropes, fabric gloves and tarpaulins trap water and mud inside, so they need thorough washing, disinfection and complete drying. Vehicle cabins and bodies include steering wheels, gear levers, door handles, seats, seat belts, truck beds and the patient compartment of rescue ambulances. Electronics such as radios, torches, phones and emergency lights must never be soaked; wipe them with a well-wrung cloth and follow the device maker's guidance.

The cost of skipping proper disinfection

Health. One volunteer down with diarrhoea or an infected wound is one less pair of hands at the moment they are needed most. If illness spreads through the team, a whole base may have to cut shifts, while vulnerable evacuees may pick up infections from the very gear meant to save them.

Money. Rescue equipment is expensive and hard to replace in a crisis. Life jackets that grow mold and keep a permanent smell are often thrown away; stretchers whose joints corrode from the wrong chemical may no longer be safe. Proper care now saves a foundation's budget later.

Time. Taking a vehicle off the road for a full interior valet, or waiting a week for soaked life jackets to dry, means a unit is not ready to deploy, even though heavy rain may return late in the season.

Trust. People put their lives in rescuers' hands. A mud-stained stretcher or a sour-smelling cabin undermines confidence for no good reason. In an age when every photo goes on social media, hygiene standards are part of an organisation's image.

Family. Many volunteers have day jobs and go home to young children or elderly parents each night. Unwashed boots, a bag set down on the base floor, or a shirt worn all day can carry germs into the house unnoticed.

Why the usual shortcuts fall short

Hosing down and stopping there. High-pressure water is great for removing mud and is an essential first step, but plain water does not disinfect. Germs remain in seams, joints and scratched surfaces, and spraying hard in a tight space can blow contaminated droplets back onto the person cleaning.

Using household bleach on everything. Bleach is cheap and useful in some situations, but it has clear limits for rescue gear. It corrodes metal, dulling and rusting aluminium fittings and springs, and makes rubber and nylon webbing brittle, faded and weaker, which is dangerous for life jackets and load-bearing ropes. Fumes in a closed cab irritate eyes and lungs, and accidentally mixing bleach with other cleaners can release hazardous gas.

Spraying alcohol. Alcohol suits hands and small areas, but it evaporates so quickly that contact time may be too short, it is flammable near engines, batteries and emergency lights, and it is not practical for a whole boat or truck bed.

Spraying disinfectant onto muddy surfaces. This is the most common mistake. Organic matter in mud uses up and interferes with disinfectant, so even the best product underperforms if the dirt is not washed off first.

Sun-drying alone or using air freshener. Sunlight helps things dry and reduces some germs, but it does not reach the foam inside a life jacket or the space under a seat. Air freshener only masks odour; it does not deal with the cause.

Chemgene HLD4H: a medical-grade disinfectant suited to rescue equipment

According to the product information, CHEMGENE HLD4H is a medical-grade high-level disinfectant made in England. It is listed as effective against bacteria, fungi and mold, mycobacteria, Salmonella and viruses including influenza H1N1, RSV, norovirus, hand-foot-mouth virus and SARS-CoV-2. The product page states that it kills within 1 minute, shows 99.85% efficacy against COVID-19, and offers residual surface protection for up to 14 days.

What makes Chemgene especially suitable for rescue work is its materials compatibility. Per the product information, it is non-corrosive to stainless steel, aluminium, rubber, plastic and fibreglass, the core materials of boats, stretchers, helmets and vehicle fittings. It is biodegradable, and the page states it is safe for people, pets and medical equipment when used as directed. One concentrate can be diluted at 1:30, 1:50, 1:60, 1:100 and up to 1:200, so teams can choose the ratio the label specifies for each risk level and stretch their budget across dozens of items.

The product page lists tests and approvals from Mahidol University, NHS England, ISO 9001:2015, ISO 13485, SGS, Intertek, CE and European standards EN 13727, EN 14348, EN 13624 and EN 14476. It is used in hospitals, clinics, laboratories, schools, offices, airports, homes, and elderly and child care settings, environments with hygiene demands close to patient transport and rescue work.

The rule to remember: Chemgene does not prevent flooding and is not medical treatment. Its role is to help reduce infection risk from surfaces during recovery. Always remove mud and wash first, then apply Chemgene at the label dilution and contact time. Wear gloves and boots, ventilate, and follow the label every time.

Step-by-step: disinfecting gear and vehicles at the base

Step 1: Set up three zones

Divide the yard into a "dirty zone" for gear returning from the field, a "wash and disinfect zone" with water, brushes, a detergent tub and a tub of diluted Chemgene, and a "clean zone" for drying and storage. Use cones or tape and make gear flow one way, dirty to clean, never backwards, so washed items are never set down beside unwashed ones.

Step 2: Put on protective gear

Cleaners should wear heavy rubber gloves, boots, splash goggles or a face shield and a mask. Cover every wound with a waterproof plaster first. Anyone with a large open wound should switch to a task that avoids dirty water.

Step 3: Remove mud and wash with detergent

Scrape off heavy mud, then rinse with moderate pressure aimed downwards, never at yourself or teammates. Scrub with a brush and detergent, focusing on seams, stitching, bolt heads, boat drain holes, stretcher legs and life-jacket buckles. Rinse until no foam remains, because detergent residue can interfere with the disinfectant.

Step 4: Disinfect with Chemgene per the label

Dilute Chemgene HLD4H at the ratio the label specifies for the contamination level. Use a low-pressure sprayer, trigger bottle or soaked cloth to wet every surface thoroughly, and leave it for the full label contact time without wiping off early. Life jackets and straps can be soaked in a tub of diluted solution as directed, or sprayed through inside and out. Soak ropes and knead them so the solution reaches the core.

Step 5: Dry completely and inspect

Hang life jackets and ropes where air moves freely; stand stretchers and spine boards upright to drain. Check for torn fabric, cracked foam, broken buckles, loose stitching or cracks in the hull. Tag damaged items "Do not use" immediately.

Step 6: Rescue vehicle and ambulance cabins

Open every door, take out rubber mats to wash separately and clear mud from the floor. Wipe high-touch points top to bottom and clean to dirty: roof grab rails, door handles, steering wheel, gear lever, handbrake, switches, seat-belt buckles, console and radio microphone. Use a well-wrung cloth near electrics. In the patient compartment, wipe the stretcher trolley, side rails, equipment shelves and floor, leave for the contact time, then air dry with doors open.

Step 7: Electronics and personal kit

Switch radios, torches and phones off, wipe with a well-wrung cloth, never spray into speaker grilles or charging ports, and check the manufacturer's guidance. Remove helmet chin straps and liners to wash separately. Scrub boot soles, spray inside and out, and dry upside down.

Step 8: Log and rotate

Keep a simple log of which item was disinfected, when, by whom and at what dilution. Shift leaders can then see instantly which kit is ready, and handovers between teams or agencies follow one standard.

10 reasons rescue teams keep Chemgene HLD4H at base

1. Broad spectrum. Per the product information it covers bacteria, fungi, viruses and mycobacteria, and you never know what each flooded lane brings.
2. Kind to rescue materials. Non-corrosive to aluminium, stainless steel, rubber, plastic and fibreglass, extending the life of boats, stretchers and helmets. See the Chemgene HLD4H product page.
3. Fast. The product page states a 1-minute kill, ideal for tight shift changes.
4. Lasting protection. Residual surface protection of up to 14 days per the product information, helping between cleaning rounds.
5. Flexible dilution. From 1:30 to 1:200, so one gallon goes a long way on a volunteer budget.
6. Hospital-grade. The same class of disinfectant used on medical equipment, suitable for ambulance compartments and patient stretchers.
7. Independently tested. From Mahidol University and NHS England to SGS, Intertek and EN standards. Read more on the WHD Chemgene page.
8. Biodegradable. Appropriate for high-volume use at wash bays that drain to sewers.
9. One product, many jobs. Gear, vehicles and shelters, simplifying purchasing and training for new volunteers.
10. Visible standards. Confidence for teammates, families and the public. Order or ask at Chemgene HLD4H medical-grade disinfectant.

Before and after: managing gear at base

Example case: a base that changed its routine in one day

Example case (an illustrative scenario, not a verified review from any organisation)

Back at Ek's base, after sending Ball to the doctor, Ek paused the morning shift for an hour to reorganise. The team taped the car park into three zones and lined up three blue tubs: detergent, clean rinse, and Chemgene diluted per the label.

Nok, a volunteer who works as a nurse, took charge of the disinfection zone. She explained why the mud must come off first and why the solution must stay on for the full contact time. Everyone got rubber gloves and goggles. Forty life jackets were washed and hung on a rope line under the roof; both stretchers and the spine board were scrubbed before spraying.

The pickup and rescue van had every door opened and mats removed, and Nok wiped high-touch cabin points in order, from roof rails to seat-belt buckles. Radios were switched off and wiped with a wrung cloth. At the exit, a boot wash and hand gel station went up with a sign: "Before going home: wash boots, wash hands, change shirt."

Two days later the life jackets had not regained their musty smell, the team could see from hanging tags which kit was ready, and when a neighbouring unit borrowed a boat, Ek handed it over with its disinfection record, which reassured them. Ball had his wound treated by a doctor and helped with coordination while it healed.

Checklist for volunteers and shift leaders

Before deploying

• Check yourself and cover every wound with a waterproof plaster.
• Wear boots and gloves; never wade barefoot or in sandals.
• Take only life jackets and gear tagged as disinfected.
• Carry clean drinking water and hand gel.
• Stay alert to electrical hazards; avoid submerged cables and report them.

During operations

• Do not rub eyes, touch your mouth or handle food with dirty gloves.
• Bag used gear separately; do not put it on vehicle seats.
• Wash hands before eating or drinking.
• Rotate rest breaks; exhaustion weakens immunity and causes accidents.

Back at base

• All gear to the dirty zone: mud off, detergent, rinse, then Chemgene per the label.
• Wipe high-touch points in every vehicle before handover.
• Dry life jackets, ropes and boots completely before storage.
• Log disinfection and pull damaged items.
• Wash boots and hands, shower and change before going home; launder flood clothing separately.

Watch for symptoms

Fever, headache, muscle pain especially in the calves, red eyes, diarrhoea, vomiting, or a red, hot, pus-filled wound mean stop work and see a doctor right away, mentioning flood exposure. Disinfectant is for surfaces and equipment only; it is not a treatment. For more on flood-related disease, see the CDC and Thailand's Department of Disease Control.

Frequently asked questions

1. Can Chemgene be used on life jackets without damaging foam or fabric?

Per the product information it is non-corrosive to rubber and plastic and biodegradable. Still, remove mud first, use the label dilution, spot-test special materials, dry completely and inspect jackets as their manufacturer recommends.

2. Do I need to rinse after disinfecting?

Follow the label. Rinse food-contact surfaces, or anything the label says to rinse, with clean water after the contact time. For general gear and vehicle surfaces, follow label and supplier guidance.

3. Can we spray disinfectant instead of washing off mud to save time?

No. Mud and organic matter stop any disinfectant working fully. The correct order is remove mud, wash with detergent, rinse, then disinfect.

4. Is it suitable for ambulance compartments and patient stretchers?

Yes. It is a medical-grade disinfectant used in hospitals and clinics, and the page states it is safe for medical equipment when used as directed. For specialised devices, also check the device maker's instructions.

5. Once gear is disinfected, can volunteers stop worrying about leptospirosis?

No. Disinfection reduces risk from equipment surfaces, but leptospirosis is usually caught while wading. Keep covering wounds, wear boots, wash after wading and see a doctor at once for fever or calf pain.

6. How often should we disinfect during the flood?

Gear that touched floodwater or evacuees: every return to base. Vehicle high-touch points: every shift change. Shared base areas such as tables, chairs and toilets: at least daily, more often when busy.

7. We need large volumes or help disinfecting a whole base. Who do we call?

Contact World Health Disinfection on 065-556-6294 or LINE @whd268 about products and our disinfection service for large buildings and sites.

Look after the people who look after everyone else

Keep Chemgene HLD4H medical-grade disinfectant at every rescue base, volunteer centre and vehicle so your team is ready for the next call with confidence.

Order Chemgene HLD4H for Your Rescue Team

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

Related pages

• Chemgene HLD4H medical-grade disinfectant
• About Chemgene
• Disinfection service for buildings and shared areas

References

• 2026 Bangkok floods (Wikipedia)
• Al Jazeera: Disaster zone declared across Bangkok
• CDC: Floods
• Department of Disease Control, Thailand