How to Use Cornstarch to Kill Cockroaches Naturally and Permanently
Cockroaches are persistent pests, but with this simple DIY method using cornstarch, you can eliminate them naturally, affordably, and effectively—without harsh chemicals.
🧪 Why Cornstarch Works
Cornstarch alone is not poisonous to cockroaches, but when combined with another key ingredient—baking soda—it becomes a deadly bait.
- Cornstarch acts as a lure: Cockroaches are attracted to it because it resembles food.
- Baking soda is the killer: Once ingested, it reacts with the acids inside the cockroach’s stomach, creating gas and causing death.
🧾 Ingredients You’ll Need
- 1 tablespoon cornstarch
- 1 tablespoon baking soda
- A few drops of sugar or honey (optional – increases attraction)
- Small shallow containers or bottle caps
🥣 Step-by-Step Instructions
1. Mix the Bait
- Combine equal parts cornstarch and baking soda in a small bowl.
- Optionally, mix in a small pinch of sugar or a few drops of honey to make it more tempting.
2. Prepare Bait Stations
- Spoon the mixture into small shallow containers like bottle caps, or spread a thin layer on cardboard pieces or paper.
3. Place the Bait
- Put bait stations in areas where cockroaches are commonly seen, such as:
- Behind the fridge
- Under the sink
- Inside cabinets
- Near garbage bins
- Along wall corners and dark cracks
4. Leave Overnight
- Cockroaches are nocturnal, so they’ll likely consume the bait during the night.
📅 Repeat & Monitor
- Replace the bait every 2–3 days or when it looks old or contaminated.
- Continue for at least 1–2 weeks to ensure you kill not just visible cockroaches, but also those hiding in nests.
🧼 Bonus Tips for Best Results
- Keep your home clean – remove crumbs and spills to make bait more appealing.
- Seal cracks and crevices – limit their hiding spots.
- Fix leaks – cockroaches love moisture.
✅ Why This Method Works
- Safe: Non-toxic to humans and pets (though keep away from children).
- Eco-friendly: No chemicals or sprays needed.
- Effective: Targets the digestive system of cockroaches directly.