Households across the UK are being warned that one of the biggest pest hotspots in the home could be hiding inside drains. While kitchens and bathrooms may look spotless, plumbing experts say pipes can harbour food residue, grease and organic matter, creating perfect breeding conditions for flies.
Cheap solution to drain flies
Ryan McNicholl of Spares Direct said many homeowners only realise they have a problem once small flies appear around sinks, showers and plugholes. He said: “You could have a perfectly clean kitchen, but inside the drain there can still be a layer of organic build-up that attracts flies. The moisture, warmth and trapped residue inside pipes create exactly the type of environment they look for, especially during the warmer months.”
While many homeowners reach for expensive chemical drain cleaners or pour boiling water down sinks as a quick fix, Ryan warns this could create bigger problems. He said: “Boiling water might seem like the obvious solution, but it’s not always the safest option for your plumbing. Many modern homes use plastic pipework and fittings, which aren’t designed to repeatedly deal with sudden extreme temperatures. Over time, excessive heat can put extra stress on seals and joints, potentially contributing to leaks or damage.”
How to use biological washing powder
Instead, Ryan recommends a cheaper cupboard alternative: biological washing powder. A standard wash using biological powder can cost around 10–15p, but using a smaller amount for drain maintenance could cost as little as 5p per treatment, making it a much cheaper option than specialist drain cleaners which can cost several pounds.
Ryan said: “Biological washing powder contains enzymes that are designed to break down organic materials, which is the same type of residue that can build up inside drains. Using a small amount with warm water can help loosen some of that grime and keep drains clean, helping to remove some of the build-up that attracts drain flies.”
Steps to use biological washing powder to help freshen drains:
- Remove any visible debris from the plughole first, such as hair, food particles or soap residue.
- Add around 1–2 tablespoons of biological washing powder directly into the drain.
- Leave it for around 30 minutes to allow the enzymes in the powder to work on organic build-up inside the pipe.
- Flush the drain thoroughly with warm water to help wash away loosened residue.
- Repeat occasionally as part of regular drain maintenance, particularly during warmer months when drain flies are more active.
Ryan said: “The key is being consistent with it. Waiting until you’ve already got flies appearing around your sink means the build-up has likely been there for some time.”
