How to Get Rid of Silverfish in Your Home (Cleaning-Based Approach)

Silverfish are one of those household pests that are unsettling primarily because of their appearance — the silvery, scale-like coating and distinctive wriggling movement — rather than because they cause immediate significant damage. But given enough time and population, they cause genuine problems: damaged books, clothing, wallpaper, photos, food packaging and any item containing starch or cellulose.

Unlike cockroaches (which are primarily food-source driven) or ants (which are typically food or water driven), silverfish have a more complex relationship with the home environment that includes moisture, temperature, darkness and specific food sources. This makes them more fully addressable through environmental management — which is largely cleaning and maintenance-based — than some other pest species.

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Understanding Silverfish Behaviour

Silverfish (Lepisma saccharina and related species) are ancient insects — among the most primitive insect species still present on earth — with specific environmental preferences:

Moisture: They require relatively high humidity (around 75–95% relative humidity for most species) to thrive and reproduce. Dry conditions significantly inhibit silverfish populations. This is the most addressable factor through home management.

Temperature: They prefer temperatures between 21–27°C — essentially normal indoor temperatures in Adelaide through most of the year, though summer heat can push above their optimal range.

Food sources: Carbohydrates and proteins, specifically:

• Starch (in paper, cardboard, book bindings, wallpaper, fabric starch)
• Cellulose (in paper and cardboard)
• Proteins (in natural fibres — wool, silk, cotton, leather)
• Synthetic glues and pastes
• Dead skin cells and other organic matter in house dust
• Food crumbs and food residue

Shelter preference: Dark, undisturbed areas with adequate moisture — spaces behind and inside walls (particularly bathrooms and kitchens), under subfloors, in stacked paper and cardboard, inside boxes in storage, in gaps behind skirting boards, and in attic/roof spaces with inadequate ventilation.

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The Cleaning and Environmental Management Approach

Moisture Reduction — The Primary Strategy

Given that high humidity is the foundational requirement for silverfish populations, reducing indoor moisture levels is the most impactful single intervention.

Bathroom and laundry ventilation: Run exhaust fans during and after showers, and when using the laundry — these are the primary household moisture-generating activities. As covered in our winter mould guide, the same ventilation practices that prevent mould also significantly reduce the humidity conditions that silverfish prefer.

Fix leaks promptly: Any plumbing leak, even slow drips, creates localised high-moisture conditions in the areas most appealing to silverfish (under sinks, inside wall cavities, under flooring). Prompt repair eliminates these ideal habitats.

Dehumidifier: For homes with persistently high indoor humidity (particularly relevant in winter in some Adelaide locations), a dehumidifier in problem areas can directly address silverfish habitat conditions. In practice, areas with high silverfish activity (such as specific storage rooms or bathroom-adjacent spaces) benefit most from targeted dehumidification.

Ventilate storage areas: Enclosed storage in attics, under-house spaces, and interior storage rooms often has limited airflow — the combination of darkness, stillness and humidity makes these ideal silverfish habitat. Even periodic ventilation (opening access panels, running a fan through briefly) disrupts these conditions.

Reducing Food Sources

Silverfish are not primarily food-source driven in the kitchen the way cockroaches are — their food sources are more environmental (paper, fabric, organic matter in dust).

Reducing accessible paper and cardboard: Stacked newspaper, cardboard boxes (particularly flattened or stored loosely), and stacked books in damp or poorly ventilated areas are prime silverfish food and habitat. Regular clearing of accumulated paper and cardboard from storage areas is directly relevant.

Sealing bulk stored dry goods: While silverfish prefer starch in paper over food items, open packets of rice, flour, oats and similar are accessible and appealing. Store dry goods in sealed containers.

Regular dusting and vacuuming in storage areas: The organic matter in house dust — skin cells, food particles, general organic debris — is a food source for silverfish in undisturbed areas. Regular vacuuming of storage areas (floor and wall junctions particularly) removes this food source.

Avoid starch-sizing in fabric storage: Some older clothing and linen storage practices involve starch — which is exactly what silverfish eat. Modern fabric storage generally doesn't involve starch, but historically starched items in longer-term storage are worth noting.

Decluttering — Eliminating Habitat

Silverfish thrive in undisturbed clutter — stacked cardboard boxes, piles of old magazines, stored clothing in accessible bags. Decluttering, particularly of paper-heavy storage (old paperwork, magazines, books not accessed regularly), removes both food and undisturbed habitat simultaneously.

In garage and outdoor storage areas (a common silverfish habitat in Adelaide homes), regular tidying and reduction of cardboard box storage (using plastic bins with lids instead) removes the primary habitat for a silverfish population that might otherwise move between the storage area and the main home.

Sealing Entry Points

Silverfish enter from external areas and spread through the building fabric — through gaps in skirting boards, around pipes, and through subfloor access points.

Sealing obvious gaps (with silicone, or with appropriate filler for larger gaps) particularly in wet areas (bathroom and laundry skirting board bases, around pipe penetrations) reduces both entry and the sheltered, moist crevice habitat that silverfish prefer for harbourage.

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Non-Chemical Targeted Treatments

If cleaning-based approaches alone haven't fully resolved an established population:

Diatomaceous earth: As mentioned in our ant control guide, diatomaceous earth applied along skirting boards, in crevices, under storage areas and around entry points creates an abrasive barrier that kills silverfish through dehydration without chemical toxicity. Apply in dry conditions (it's less effective when wet) and reapply after any moisture exposure.

Cedar: Cedar blocks, balls and hangers in wardrobes and storage areas repel silverfish through aromatic compounds. Less effective than diatomaceous earth at killing an established population but useful as a deterrent in vulnerable storage areas.

Boric acid: Applied carefully in out-of-the-way areas (under skirting boards, in void spaces, in storage areas inaccessible to children and pets), boric acid provides residual effect against silverfish. Follow label instructions and exercise appropriate caution.

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When to Engage Pest Control

If a home has a long-established silverfish population and the cleaning-based approaches above haven't produced significant improvement within 6–8 weeks of consistent implementation, a licensed pest controller can apply residual insecticide treatments in the specific harbourage areas (including subfloor and roof void access, which are often the primary source populations for in-home silverfish) with professional-grade products that provide more complete control than surface approaches.

The cleaning-based approach should still be implemented alongside professional treatment — eliminating the environmental conditions that supported the population prevents re-establishment after treatment.

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For Adelaide home cleaning service in Adelaides including thorough storage area and bathroom cleaning that supports silverfish prevention, contact PF Cleaning Adelaide.

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Written by Victor Jacon — Master Cleaner & Home Detailing Specialist, Founder of PF Cleaning Adelaide.