There are dozens of DIY fly products available — aerosol sprays, UV zappers, sticky strips, smoke bombs, and natural repellents. Some are genuinely effective for specific situations; others are a waste of money.
This guide gives an honest assessment of each common DIY fly product, when it works, when it does not, and when you need to call a professional instead.
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Aerosol Fly Sprays
The most commonly purchased fly product. Available in every supermarket.
How they work: Contain pyrethroid insecticides that knock down and kill flies on contact. Spray directly at the fly or into the air.
Effectiveness: Good for killing individual flies quickly. Provides no lasting protection — the effect disappears within minutes. Does not address the breeding source.
Best for: Occasional house flies. Killing individual flies in the short term.
Not effective for: Large infestations, cluster flies in lofts, or any situation where the breeding source is not addressed. Not suitable for food preparation areas.
Verdict: Useful as a quick fix but not a solution. If you are spraying every day, you have a breeding source that needs professional attention.
Electric UV Fly Killers (Zappers)
Wall-mounted units that attract flies with UV light and kill them on an electrified grid or sticky board.
How they work: UV light attracts flies. Insect-o-cutor style units electrocute them; glue board units trap them.
Effectiveness: Very effective for house flies and bluebottles in enclosed spaces. The industry standard for commercial kitchens and food preparation areas. Glue board models are preferred in food businesses (no risk of insect fragments falling into food).
Best for: Kitchens, restaurants, bars, bakeries, and food storage areas. Ongoing fly management in commercial settings.
Not effective for: Cluster flies (too sluggish to be attracted to UV). Outdoor use (competing light sources). Large infestations without source removal.
Verdict: Excellent for commercial food environments. A worthwhile investment for any kitchen with recurring fly problems. Replace UV tubes annually as they lose effectiveness.
Sticky Fly Strips and Window Stickers
Adhesive strips or window stickers that trap flies on a sticky surface.
How they work: Flies land on the adhesive surface and become stuck.
Effectiveness: Effective at catching small numbers of flies. Particularly useful for cluster flies on windows — they are sluggish and land readily on window surfaces.
Best for: Cluster flies on windows. Monitoring fly activity. Low-tech, non-chemical option.
Not effective for: Large infestations. House flies in kitchens (unsightly and unhygienic). Any situation where the breeding source is not addressed.
Verdict: Cheap and effective for cluster flies on windows. Not a solution for significant infestations but a useful monitoring and reduction tool.
DIY Smoke Bombs / Foggers
Small canisters that release insecticidal smoke when ignited.
How they work: The smoke fills an enclosed space, killing flying insects on contact.
Effectiveness: Can reduce cluster fly numbers in lofts but coverage is much less complete than professional ULV fogging. The particles are larger and settle faster, leaving untreated gaps in cracks and crevices.
Best for: Small loft spaces with moderate cluster fly numbers. A temporary reduction before professional treatment.
Not effective for: Large loft spaces. Heavy infestations. Long-term control (no residual effect). Open-plan rooms or kitchens.
Verdict: A reasonable DIY option for mild cluster fly problems in small lofts. For serious or recurring infestations, professional ULV fogging provides far superior coverage and results.
Need professional help with cluster fly pest control? BuzzKill Pest Control offers fast, effective treatment with no call-out charge.
Vinegar Traps (Fruit Flies)
A jar or bowl of apple cider vinegar covered with cling film pierced with small holes.
How they work: Fruit flies are attracted to the fermenting vinegar, enter through the holes, and cannot escape.
Effectiveness: Genuinely effective for fruit flies. A simple, free, and non-chemical approach that catches significant numbers.
Best for: Fruit fly problems in kitchens. A complement to hygiene measures.
Not effective for: Any other fly species. Fruit fly breeding sources (the trap catches adults but does not stop new ones hatching).
Verdict: Works well for fruit flies. Use alongside thorough cleaning — remove overripe fruit, clean drains, and wipe up spills. The trap reduces adults while hygiene measures eliminate the breeding source.
Natural and Herbal Repellents
Products and home remedies claiming to repel flies using natural ingredients — citronella, lavender, peppermint, eucalyptus, cloves, and lemongrass.
How they work: Strong scents are claimed to deter flies from an area.
Effectiveness: Minimal and short-lived. Some essential oils may briefly deter flies from a very localised area, but flies quickly habituate or simply move to a different part of the room. No independent evidence supports natural repellents as effective fly control.
Best for: Personal comfort outdoors (citronella candles at a garden table). Pleasant fragrance.
Not effective for: Any indoor fly problem. Infestations. Cluster flies. Commercial premises.
Verdict: Do not rely on natural repellents for fly control. They may make outdoor dining slightly more pleasant but have no meaningful impact on an infestation.
When to Call a Professional
DIY products are useful for managing small numbers of flies and complementing good hygiene. But they cannot solve a significant infestation because they do not address the breeding source or provide professional-grade residual protection.
Call a professional when: flies return daily despite cleaning; cluster flies fill your loft every autumn; you cannot locate the breeding source (possible dead animal or hidden drain issue); or you run a food business and need compliant pest management.
BuzzKill provides fly treatment from £120. Visit our Fly Control page or call 0203 468 1999.
Frequently Asked Questions
What is the best DIY product for cluster flies?
Sticky window stickers are the most practical DIY solution for cluster flies — they catch the sluggish flies as they sit on windows. For lofts, a DIY smoke bomb provides some reduction but is far less effective than professional ULV fogging.
Are electric fly killers worth the money?
Yes — for house flies in kitchens and food businesses, they are one of the most effective fly management tools available. For cluster flies and outdoor use, they are not effective. Replace UV tubes annually.
Do citronella candles keep flies away?
Citronella may very slightly reduce fly activity in the immediate area outdoors, but the effect is minimal and temporary. It is not an effective fly control measure for indoor use or infestations.
Can I fog my own loft for cluster flies?
DIY smoke bombs are available and can reduce numbers in small spaces. However, professional ULV fogging produces a much finer mist that gives complete coverage of the loft including all cracks and voids. For recurring or heavy infestations, professional treatment is recommended.
Why do shop-bought fly sprays not solve the problem?
Aerosol sprays kill flies on contact but provide no residual protection and do not affect the breeding source. New flies emerge from the source within hours. Without finding and eliminating where they are breeding, spraying is a temporary measure that needs repeating indefinitely.
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