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A trail of ants marching through the kitchen, a cockroach scurrying under the sink… scenes we could all do without. When faced with a crawling insect invasion, the first instinct is often to find a drastic and immediate solution. However, not all products are created equal. Choosing the right long-lasting insecticide is crucial to regaining your peace of mind without having to repeat the process every week.
To help you make an informed choice, we've analysed the pitfalls to avoid and the essential criteria for a truly smart purchase.
The insecticide aisle is overflowing with promises. To avoid wasting your time and money, here are the most common traps:
For truly durable protection that's right for your home, three criteria must be scrutinised.
The residual effect is a product's ability to remain active long after it has been applied. This is THE number one criterion for a long-lasting crawling insect killer. A product with a good residual effect creates a true insect barrier that continues to work for weeks, or even months.
Check the promised duration of protection (e.g., 6-month insect barrier) and the conditions required to achieve it (usually on unwashed surfaces). Molecules like Acetamiprid are known for their persistence, offering both curative action (eliminates existing insects) and preventive action (blocks new infestations).
Not all pests are susceptible to the same molecules. It is therefore essential to choose a product that targets the insects causing you problems.
Effectiveness isn't everything: a good insecticide must also be practical. Ready-to-use sprays are the most common for treating strategic entry points: baseboards, door and window frames, cracks, etc. Opt for a non-staining formula and, for indoor use, one without a lingering odour. And of course, always read the instructions for safe and effective application.
To illustrate these criteria in practice, here is our selection of products suited to different needs.
Why we recommend it: Perfect for those who want a "set it and forget it" solution. A single application on entry points creates a protective barrier that is effective for several months, both indoors and out.
It bypasses the "flash in the pan" effect thanks to its residual formula. The manufacturer claims up to 6 months of effectiveness on unwashed surfaces.
Its dual curative and preventive action works on most crawling insects (cockroaches, ants, spiders, fleas). A bonus: it's made in France.
Why we recommend it: The all-in-one solution for those battling both crawling and flying insects. Its odourless formula is a real plus for living areas and bedrooms.
It avoids the trap of a harsh formula. Being odourless, it dries quickly and leaves no trace, thus protecting your floors and furniture.
Its versatility against the majority of household insects. Its action persists for several weeks, providing continuous protection.
Why we recommend it: The ultimate weapon against ant invasions. Rather than killing the few visible workers, this bait uses them to poison the entire ant hill. The problem is solved at the source in a matter of weeks.
It puts an end to surface sprays, which are often ineffective against a well-established colony. This is a deep treatment, not just a band-aid solution.
Its devastating effectiveness on the entire colony, including the queen. The bait station is discreet and can be easily placed along ant trails.
Explore our full selection of tested and approved products that meet our selection criteria and comply with regulations.
Preparation is key. Start by thoroughly cleaning and drying the surfaces. Then, spray the product evenly on strategic areas: baseboards, door and window frames, under sinks, behind furniture, and along pipes. Let it dry completely before allowing children and pets back into the area. Most importantly, do not wash the treated surfaces, as this will destroy the protective barrier.
Safety first. The golden rule: read and follow the instructions on the label to the letter. As a general rule, keep children and pets away from the treated area during application and until the product is completely dry. Never spray on toys, pet beds, or kitchen countertops. If in doubt, ventilate the room thoroughly after treatment. The legal notice "Use biocides with caution" isn't just for decoration.
Knock-down (or curative) action has an immediate effect: it kills insects on contact. It's ideal for stopping a visible infestation in its tracks. Residual (or preventive) action is the most important for long-term control: the product remains active on the surface and continues to eliminate pests that venture onto it for weeks to come. The best long-lasting insecticide is one that intelligently combines these two actions: it solves the problem on the spot and prevents it from coming back.