UK homes urged to put bleach and boiling water in drains in September

Households across Britain are being warned to prepare for an invasion of silverfish as colder, damper weather sets in this September. Experts say the tiny insects thrive in humid homes and could become a bigger nuisance in the coming weeks.

Silverfish, which measure between 12mm and 19mm, are known for feeding on sugars and starches found in household items such as books, photographs, documents and wallpaper. While they do not bite humans, their presence can trigger allergies, particularly in people sensitive to dust mites and similar bugs.

Bathroom and kitchen drains are common entry points for silverfish, prompting home specialists to advise residents to pour bleach followed by boiling water into sinks and basins to deter the pests.

"The silver-scaled bugs are one of the most frustrating problems to deal with in bathrooms," said Andy Ellis, bathroom specialist at Vidalux. "They like to come and go the moment they sniff out any dampness in a home."

Silverfish thrive in dark, moist areas such as bathrooms, kitchens and behind radiators where damp towels are hung. They often leave behind tell-tale yellow stains as evidence of their presence.

As temperatures drop and central heating increases humidity indoors, experts expect infestations to rise.

How to prevent silverfish at home

• Improve ventilation: Ensure air vents work properly to reduce bathroom steam and condensation.

• Flush drains: Use bleach and boiling water in sinks and basins to discourage silverfish from climbing up through pipes.

• Dry bathroom mats: Hang mats after every shower to stop damp environments forming.

• Reduce humidity: Invest in a dehumidifier, particularly for bathrooms and kitchens.

• Use lavender oil: The scent deters silverfish; cotton pads soaked in the oil can be placed near drains and toilets.

• Clean hiding spots: Regularly check behind radiators and dark corners where the insects may gather.

If infestations persist, professionals may need to be called in to investigate whether hidden leaks or structural damp are fuelling the problem.

While silverfish are largely harmless, specialists warn that without preventative measures, they can quickly multiply and damage household items over the winter months.