Start with what you know
Killing adult flies will not stop new flies emerging. The key is to locate the wet or decaying material where larvae are developing.
Why this problem happens
Small flies may breed in drain residue, recycling containers, overripe produce, mop water or a hidden leak. Different fly groups favour different sources, so a close photo is useful.
What you can do now
- Empty and wash bins and recycling containers, including the base and lid.
- Clean food residue beneath appliances and around floor edges.
- Check drains for slime and use proper mechanical cleaning rather than pouring random chemicals.
- Remove overripe fruit and allow wet cleaning equipment to dry.
What not to do
Do not keep spraying adults while the breeding source remains. Never mix drain chemicals, bleach or insecticides.
When to call a professional
Get help when flies continue for more than a week after cleaning, appear from a structural void, or affect a food business where identification and records matter.
A useful visit should end with a clear explanation of what was found, what was treated, any limits on access, and the next review point. Ask for the total scope and price before authorising work.
Common questions
Why do flies return after I clean the sink?
The source may sit deeper in drain residue or somewhere else nearby.
Can flies come from a dead animal?
Yes. A sudden cluster of larger flies can be linked to concealed organic material.