Residual Insecticide Sprays

A residual insecticide spray is designed to keep working after it dries, leaving a treated barrier on surfaces that insects crawl across later. It’s ideal for ongoing control when pests are hiding or you’re dealing with repeat activity (rather than only spraying visible insects).

Residual sprays work best when applied to insect pathways and harbourages, not sprayed into the air. Focus on:

• Along skirting boards, corners, and edges of rooms
• Cracks and crevices, gaps around pipes, and under units
• Behind/under appliances (fridge/cooker), under sinks, and cupboard gaps
• Around likely entry points like door thresholds and window frames (where label allows)

Aim for a light, even application on surfaces insects are likely to cross.

Residual performance depends on the product and conditions, but in general they keep working until the treated surface is disturbed (heavy cleaning, moisture, abrasion) or the label’s time window is reached. Check treated areas regularly—if activity returns or surfaces have been washed/cleaned, it’s usually time to reapply in line with the label directions.