Woke up with a row of red welts on your arm, blood spots on the sheet, tiny black dots in the mattress seams? Chances are you’ve got bed bugs (Cimex lectularius — called 臭蟲, 床蝨 or 木蝨 in Chinese). Don’t panic — it’s not the end of the world.
This 6-step DIY method is compiled from the Food and Environmental Hygiene Department (FEHD)’s guidelines on bed bug control in domestic premises, the Centre for Health Protection (CHP), the Consumer Council’s six bed-bug elimination methods, and Rentokil Hong Kong’s guide. Light to moderate infestations are manageable on your own — but you also need to know when to stop and call the professionals.
Before you start: confirm it first, don’t spray blindly
Many people spray insecticide everywhere at the first sight of a rash, which only drives bed bugs deeper into the flat — worse than doing nothing. Step one is always: confirm you actually have bed bugs.
According to Rentokil Hong Kong, the six signs of infestation:
- Live bugs: about 6mm, reddish-brown, flat and oval, hiding in mattress seams and bed-frame joints
- Droppings: rust-coloured or black spots on the mattress and frame (also noted by the CHP)
- Eggs: off-white, about 1mm, barely visible to the naked eye
- Cast skins: translucent empty shells
- Blood spots: tiny bloodstains on sheets, left when a bug is crushed during sleep
- Odour: a musty smell in severe infestations
Grab a torch and check: mattress folds and seams, bed-frame joints, behind the headboard, sofa crevices, wallpaper edges, around power sockets. Only proceed if you find two or more signs.
Tools you’ll need
- A powerful vacuum cleaner with a narrow crevice nozzle
- A steam cleaner (continuous steam is best)
- Large sealable plastic bags
- Laundry bags that withstand a 60°C machine wash
- A torch
- (Optional) Bed-leg interceptors or double-sided tape for monitoring later
Step 1: inspect thoroughly, map the “hot zone”
Check every spot with the torch and note where you find signs. Bed bugs hide by day and feed by night, so harbourages are usually close to where you sleep: mattress, bed frame, bedside table, sofa — only spreading to wall cracks and sockets in severe cases. Knowing the hot zone means nothing gets missed later.
Step 2: isolate — don’t let them spread
- Put affected sheets, bedding and clothing straight into sealed bags. Don’t dump them on the floor or carry them into another room
- Declutter the room — more clutter means more hiding places
- Don’t move suspicious items into other rooms during treatment
Step 3: hot wash and dry
Per FEHD and CHP guidelines:
- Wash infested blankets, bedding and clothing in 60°C hot water
- Tumble-dry on high heat afterwards, or dry in strong sunlight / hot iron
- Small items that can’t be washed (books, soft toys, shoes): seal in a bag and put in a -18°C freezer for 24 hours
Heat is one of the most effective physical weapons against bed bugs — adults, nymphs and eggs all die at high temperatures.
Step 4: vacuum up bugs, eggs and droppings
- With the crevice nozzle, go over the mattress surface and seams, every bed-frame joint, behind the headboard, skirting boards and sofa crevices
- One round is not enough — repeat every week
- Immediately after vacuuming, empty the dust bag or canister into a sealed bag and bin it outside — don’t leave it in the flat overnight
Step 5: steam the cracks
Per FEHD guidelines and the Consumer Council’s six methods, direct hot steam into cracks and crevices where bed bugs were found: mattress edges, bed-frame gaps, skirting-board joints. Steam heat kills bugs and eggs on contact. Don’t over-wet — ventilate and keep things dry afterwards, as dampness doesn’t help.
Step 6: monitor and repeat — don’t stop after one round
This is the most important step, and the most skipped. Per the CHP, bed bug eggs hatch in about one week at room temperature, so:
- Repeat inspection + vacuuming + steaming every week for several weeks
- Put interceptors or double-sided tape on bed legs to see if bugs are still trying to climb up
- Keep going as long as you see fresh signs — don’t stop early
Things you must NOT do
- Don’t spray insecticide randomly indoors: per Rentokil’s guide, “super bed bugs” with insecticide resistance have emerged in some regions. Random spraying may not kill them and will drive bugs into other rooms, spreading the problem.
- Don’t throw out the mattress/furniture: dumping them in the corridor spreads bugs through the whole building, and whoever picks them up gets infested too. Without eliminating the source, a new mattress gets infested just the same.
- Don’t treat only one room: bed bugs walk into neighbouring rooms. Inspect the whole flat, not just the bedroom.
When to call a professional pest controller
If signs persist after several weeks of DIY, or if:
- The infestation has spread across rooms, or neighbours report it too
- The whole building is affected and needs coordinated treatment
- You’re not even sure it’s bed bugs
- It’s seriously affecting daily life
The Consumer Council advises: before hiring, ask what methods they use, how fees are calculated, and how many follow-up visits are included — don’t judge on price alone.
Hong Kong-specific notes
- Subdivided flats / public housing estates / tenement buildings: small, crowded units let bed bugs travel easily through wall cracks and pipes into neighbouring flats. Notify the landlord, building management or owners’ corporation so the whole floor is treated together.
- Parcel cardboard boxes: delivery boxes from Taobao, Pinduoduo and other online shopping platforms are a common entry route in Hong Kong. Unpack and discard boxes immediately — never leave them by the bed or in the bedroom overnight.
- Second-hand furniture: inspect thoroughly before bringing it in; heat-treat anything suspicious first.
- Travel: per CHP advice — use a hard-shell suitcase, seal clothes in bags, inspect the hotel bed and mattress for signs on arrival, and never put luggage on the carpet. Back in Hong Kong, inspect luggage and clothing immediately; hot-wash and steam anything suspicious.
FAQ
Q: Do bed bug bites spread disease?
A: Per the FEHD and CHP, there is currently no evidence that bed bugs transmit disease. But scratched bites can get infected with bacteria — so don’t scratch.
Q: What are “super bed bugs”?
A: Per Rentokil’s guide, strains with resistance to common insecticides have emerged in some regions, so ordinary sprays may not work. That’s another reason not to spray randomly.
Q: How long until they’re gone?
A: Eggs hatch in about a week at room temperature (CHP), so monitor and repeat treatment for several weeks to catch newly hatched bugs. Don’t stop after one round.
Q: Can I just use insecticide spray?
A: Not recommended. Resistance plus the scattering effect make sprays unreliable; physical methods (hot washing, vacuuming, steam) are the backbone of DIY. The CHP notes residual insecticides can be used in crevices, but preferably by someone who knows how — or a professional.
References
- Food and Environmental Hygiene Department, Guidelines on Prevention and Control of Bed Bugs in Domestic Premises (PDF, in Chinese): https://www.fehd.gov.hk/tc_chi/pestcontrol/library/pdf_pest_control/bedbugs(text).pdf
- Centre for Health Protection, Bed bugs (page in Chinese; use browser translation if needed): https://www.chp.gov.hk/tc/healthtopics/content/460/107441.html
- Rentokil Hong Kong, bed bug signs guide: https://www.rentokil.com/hk/blog/signs-of-infestation/signs-of-bed-bugs
- Consumer Council’s six bed-bug methods (via gotrip.hk, in Chinese): https://www.gotrip.hk/生活百科/消滅床蝨-滅蝨方法-gt12-358554/