Monsoon Dengue Prevention Checklist: 10 Home Checks

Reviewed for scientific accuracy by Arun Radhakrishna, PhD, Head of R&D and partner at Green Molecule, pharmaceutical scientist and patent holder.

Why I wrote this. My son had dengue. That is why a cleaning brand is writing about a mosquito-borne disease. We make cleaners, not medicine, so the prevention advice here follows what WHO and national health agencies advise.

Dengue is caused by a virus, and Aedes mosquitoes are its vector: they carry it from person to person in a loop. An infected female bites someone and passes the virus on in her saliva. Another mosquito picks it up from that person's blood, whether or not they feel ill. After about 8 to 12 days in warm weather, she can infect the next person she bites.

You cannot catch dengue by touching a sick person, or from surfaces, food or water. The loop runs through the mosquito, so it breaks when mosquitoes can't breed or can't bite. (WHO dengue fact sheet)

These mosquitoes breed in water that collects in ordinary household containers. A cooler tank, a plant saucer or a forgotten bucket is enough, which makes your home the place to break the loop. The ten checks below show where to look.

This checklist is for households anywhere the monsoon brings standing water. Rainy months differ across Asia, so follow your local rains and not the calendar: start when the rain starts and keep going for a few weeks after it stops.

Why weekly, and why scrub

A weekly check works because a mosquito egg takes 7 to 10 days to become a flying adult. Empty a container once a week and the larvae in it never finish growing.

Emptying is only half the job. The female lays her eggs on the inside wall of the container, just above the waterline, where they cling firmly and can survive dry for months (up to 8 by the US CDC's figure, more than a year by India's NCVBDC). Pour the water out and the eggs stay behind, ready to hatch the next time the container fills.

That is why most of the checks below say "scrub", not just "empty". A stiff brush on the inside walls is what removes the eggs. (CDC: Life Cycle of Aedes Mosquitoes)

10 home checks to prevent dengue

1. Walk the house once a week. Go through every room, the balcony, the terrace and the yard, looking for any container that holds water. Repeat the walk after heavy rain. Weekly is the rule because it beats the mosquito's 7 to 10 day growth cycle.
2. Cover stored water. Keep tanks, drums and storage buckets under tight lids with no gaps, including overhead tanks and sumps. Empty containers you no longer need. Scrub the inside wall of a drum before you refill it.
3. Clean air coolers every week. Drain the tank, scrub the inside walls and let it dry before refilling. When the cooler is out of season, leave it empty and dry.
4. Check the trays nobody looks at. Pull out the drip pan behind or under the refrigerator, and the tray under the air conditioner or dish rack. Empty and scrub them. They hold water for weeks because they are out of sight. For the inside of the fridge, see our fridge-cleaning guide.
5. Empty plant saucers and vases. Tip out saucers and scrub them. Change vase water at least once a week and scrub the vase each time. Do the same for money plant bottles and lucky bamboo pots.
6. Empty buckets after use. Don't leave water sitting in mop buckets, bathroom buckets or laundry soaking tubs. Scrub them and store them upside down.
7. Clear anything that can catch rain. Bottles, tins, tyres, coconut shells, broken pots and old toys all hold enough water for eggs. Throw them out, turn them over or store them under cover.
8. Check roofs, terraces and gutters. After rain, look for pooled water and blocked outlets. Sweep the water away, clear leaves from gutters and fix leaks that keep an area wet.
9. Refresh pet bowls and bird baths. Give pets fresh water every day and scrub the bowl when you do. Check around kennels and feeding areas for trays that have filled with rain.
10. Stop bites, all day. Dengue mosquitoes are active in the daytime, so a bed net at night is not enough protection. Keep door and window screens intact and wear clothes that cover arms and legs. Use a repellent containing DEET, picaridin or IR3535, as its label directs.

The weekly cover, empty and clean routine and the bite protection in check 10 follow the WHO dengue fact sheet. The breeding places, including refrigerator drip pans, are those listed by India's NCVBDC.

How cleaners help, and where they stop

Scrubbing works by physically removing eggs, so the brush does the work. Official guidance asks for emptying, scrubbing and drying, and names no special chemical. Use the household cleaner you normally would.

From our range, two cleaners fit these jobs. Neither is a mosquito treatment: the brush removes the eggs, and the cleaner handles the grime.

What you're scrubbing	Our pick	How
Pet bowls, vases, water drums and buckets	Dishwashing Liquid	Scrub the inside walls, then rinse well before refilling
Fridge drip pan, AC tray, cooler tank, plant saucers	All-Purpose Cleaner	Scrub with a brush, then leave to dry

What a cleaner adds to the brush:

• It makes the scrub easier. Detergent loosens the slime and dirt on container walls, so scrubbing them clean takes less effort.
• It leaves the container fit to refill. A washed and rinsed drum, bowl or vase can go straight back into use.
• It handles everyday germs. Both cleaners above are NABL-lab tested to kill 99.99% of germs. That is a hygiene benefit, separate from dengue, which spreads through mosquito bites.

Where cleaning stops:

• No cleaner repels mosquitoes or prevents bites. Cleaning removes breeding sites. Screens, clothing and repellent stop bites. You need both.
• Keep cleaning chemicals out of drinking and cooking water. Scrub storage containers when they are empty, and rinse them well before refilling.
• Some water can't be emptied or covered. For a large outdoor tank or cistern, ask your local health department which larvicide is approved. WHO lists insecticide treatment as an option for outdoor storage containers.
• One clean home is not enough. Dengue prevention takes a community effort. Aedes mosquitoes stay close to where they breed, flying only a few blocks in their lifetime. Check shared spaces such as terraces, parking areas and gardens, and encourage neighbours to check theirs too.

When to see a doctor

See a doctor for a high fever during the rainy season, and ask about a dengue test. Symptoms usually start 4 to 10 days after the bite: high fever, severe headache, pain behind the eyes, muscle and joint pain, nausea or vomiting, and a rash.

Go to a hospital immediately if any of these appear. They often show up just as the fever is going down:

• severe stomach pain, or vomiting that won't stop
• bleeding from the gums or nose, or blood in vomit or stool
• fast breathing
• extreme tiredness, restlessness, or pale and cold skin

For fever and pain, WHO advises paracetamol and warns against ibuprofen and aspirin, which raise the risk of bleeding. Rest and drink plenty of fluids. (WHO dengue fact sheet)

This article is general information and does not replace advice from a doctor.

Frequently asked questions

Can dengue spread from one person to another?

Not directly. You can't catch it by touching, sharing food with or sitting near someone who has it. A mosquito has to bite the infected person and then bite you. The rare exceptions are from mother to baby during pregnancy, and through blood transfusion or organ donation.

Why isn't emptying the water enough?

The eggs are not in the water. They are stuck to the inside wall of the container, just above the waterline, and can survive dry for months. Scrubbing the wall removes them.

How often should I clean my air cooler?

Once a week during the rainy season. Drain the tank, scrub the inside walls and let it dry before refilling.

Can a cleaner or disinfectant kill dengue mosquitoes or their eggs?

Don't rely on one to. Household cleaners are not tested or approved as mosquito treatments. The brush removes the eggs, and the cleaner makes the scrubbing easier.

What time of day do dengue mosquitoes bite?

During the day. That is why screens, covering clothes and repellent matter in daylight hours, and why a bed net at night is not enough.

Can you get dengue more than once?

Yes. WHO notes that a second infection carries a higher risk of severe dengue, so anyone who has had it before has even more reason to prevent bites.

Sources

• World Health Organization: Dengue fact sheet, 21 August 2025. Prevention steps, repellents, symptoms and warning signs.
• US CDC: Life Cycle of Aedes Mosquitoes, reviewed 16 April 2024. Growth cycle, where eggs are laid, flight range.
• NCVBDC, Government of India: Vector of Dengue Fever. Breeding places and daytime biting.