We’ve all been there. You see a massive cockroach scuttle under the fridge. You rush to the shops, buy a can of surface spray or a “bug bomb,” and go to war.
For a few days, it seems to work. But a week later? They’re back. Here is why DIY sprays often fail—and why professional treatment is actually cheaper in the long run.
The “Knockdown” vs. The “Transfer” Most supermarket sprays are “repellents” or “knockdown” agents. They kill the bug you hit directly, but they repel the others, forcing them deeper into your walls and roof voids where they breed safely.
Professional treatments (like the ones we use at McKenna) utilize the “Transfer Effect.” We use non-repellent chemicals, gels, and dusts. The cockroach walks through the treatment but doesn’t die immediately. Instead, it returns to the nest and spreads the product to the rest of the colony. One treated cockroach can eliminate dozens of others.
Reaching the Source Cockroaches love warm, hidden places—behind your dishwasher, inside your toaster, and in your roof void. A spray can won’t reach there. Our technicians use specialised dusting equipment to blow treatment into roof voids, sub-floors, and cracks where sprays can’t go.
Safety for Pets and Family Overusing aerosol sprays fills your home with fumes. Professional targeted application places the chemical only where the pests are, keeping your benchtops, floors, and family safe.
Ready to stop the cycle? Stop buying can after can.
