Domakihub How to Get Rid of Gnats Fast — 5 Steps That Actually Work
Kill the source, trap the adults, and keep gnats gone for good.
Reviewed by Domakihub home & decor pros · 2026-06-23 · 5 min read
Gnats are a familiar nuisance in Greek homes and holiday rentals — warm kitchens, potted plants, and overripe fruit are all they need to establish a swarm in days. The video above gives you a quick visual overview, while this guide walks through each step in detail so you can clear an infestation and stop it coming back. Whether you are managing a family home in Athens, a villa on Crete, or a small hotel in the Peloponnese, the method is the same: remove what feeds them, trap what is flying, and seal the route in.
Why gnats appear in Greek homes
Greece's warm, humid summers create perfect conditions for both fruit flies (Drosophila) and fungus gnats (Bradysia species). Fruit flies breed in fermenting organic matter — overripe tomatoes, open wine bottles, juice residue in recycling bins. Fungus gnats prefer the moist soil of potted plants, which is common in balcony gardens and hotel lobbies.
An adult gnat lives only a week or two, but a single female can lay up to 300 eggs. That means a small problem in a vacation rental can look catastrophic by the time the next guests arrive. Acting on the first signs — a few flies hovering near the sink or soil — is far easier than dealing with a full infestation.
Knowing which gnat you have
Fruit flies are about 3 mm long with red eyes and a tan body; they hover around food, drains, and bins. Fungus gnats are slightly darker, more mosquito-like, and fly erratically near plant pots. Both are harmless to humans but distressing for guests and bad for hygiene ratings. The control steps overlap heavily, but identifying the species helps you find the breeding site faster.
5 steps to get rid of gnats
- 1
Find and eliminate every breeding site
Gnats cannot be trapped out of existence if the breeding site remains. Check overripe fruit on the counter, the inside of recycling bins, the drip trays under potted plants, and the u-bend of kitchen and bathroom drains. Remove any rotting produce, rinse bins with hot soapy water, let potted-plant soil dry out between waterings, and pour a kettle of boiling water or a cup of diluted bleach down slow-draining sinks.
- 2
Set apple cider vinegar traps
Pour a couple of centimetres of apple cider vinegar into a small glass or jar, add two drops of washing-up liquid (which breaks the surface tension so gnats sink), and cover tightly with cling film pierced with a toothpick. Place one trap near each hotspot — the fruit bowl, the bin area, and each plant pot. Empty and refresh traps every two to three days. This is the fastest way to knock down the adult population while you address the source.
- 3
Treat potted-plant soil for fungus gnats
If gnats are clustering around houseplants, the larvae are almost certainly living in the top layer of compost. Let the soil dry completely between waterings — larvae cannot survive in dry medium. For a faster result, apply a diluted neem-oil solution (one teaspoon neem oil plus a few drops of liquid soap per litre of water) as a soil drench. Repeat weekly for three weeks to break the egg-to-adult cycle. Sticky yellow cards placed at soil level will also catch adults.
- 4
Clean drains with enzymatic cleaner or baking soda and vinegar
Kitchen and bathroom drains accumulate a biofilm of organic matter that is a prime breeding site for drain gnats. Pour half a cup of baking soda down the drain, follow with half a cup of white vinegar, leave for fifteen minutes, then flush with boiling water. Do this weekly. For persistent problems, an enzymatic drain cleaner (available in Greek hardware stores as 'αποχοκαθαριστικό') will digest the biofilm over several treatments.
- 5
Prevent re-infestation with small habit changes
Once the swarm is gone, keep it gone: store fruit in the fridge or in sealed containers during warm months, clean recycling bins weekly, empty bin liners every day in summer, water plants only when the top two centimetres of soil are dry, and fit a mesh or fine-gauge drain cover in kitchen sinks. For holiday rentals and hotels, include a drain-cleaning step in the changeover checklist — a one-minute task that saves a guest complaint.
Rather have a pro handle it?
Get a vetted pest control pro in your city — one number, booked in EN/EL/DE.
FAQ
- How long does it take to get rid of gnats completely?
- With consistent effort — removing breeding sites and running traps — most infestations are under control within one to two weeks. The biological cycle from egg to adult is roughly three weeks, so you need to maintain your measures for at least that long to catch each new generation.
- Are gnats harmful to people or pets?
- Common house gnats (fruit flies and fungus gnats) do not bite, do not transmit disease to humans, and are not toxic to pets. They are a hygiene and comfort concern rather than a health risk. However, biting midges (nο-see-ums), which are also sometimes called gnats in casual speech, do bite and are common near water in coastal Greece — for those, insect repellent and window screens are the right approach.
- Can I use a commercial spray to kill gnats?
- Yes, pyrethrin-based insect sprays available in Greek supermarkets will kill adult gnats on contact, but they will not reach larvae inside drain biofilm or soil. Sprays are a short-term fix; they work best as a complement to source removal, not a substitute. Avoid spraying near food preparation surfaces, and ventilate rooms well after use.