How to treat a sofa for lice and nits at home? - briefly
First, vacuum the upholstery thoroughly to extract adult insects and eggs, then apply an approved lice‑killing spray or a 1 % permethrin solution, allowing the recommended contact time before the fabric dries. Repeat the treatment after seven days to eradicate any newly hatched nits.
How to treat a sofa for lice and nits at home? - in detail
Inspect the furniture thoroughly. Use a bright lamp and a fine‑toothed comb to locate live insects and eggs on fabric, seams, and cushions. Mark affected areas with a washable pencil.
Vacuum every surface. Attach a brush nozzle, run the machine slowly over upholstery, crevices, and under cushions. After vacuuming, seal the bag or container in a plastic bag and discard it outside the home.
Launder removable covers. If the sofa has slipcovers, pillowcases, or throws, wash them in hot water (minimum 130 °F/54 °C) for 30 minutes, then tumble dry on high heat. For non‑removable fabric, spot‑clean with a detergent solution (1 part detergent to 4 parts water) and a clean cloth.
Apply a heat treatment. Use a handheld steam cleaner set to the highest safe temperature for the upholstery. Pass the steam head over all areas for at least 10 seconds per spot, ensuring the fabric becomes damp but not soaked. Heat kills both insects and eggs.
Use a residual insecticide if heat alone is insufficient. Choose a product labeled for indoor fabrics, containing 1 % permethrin or a pyrethrin‑based spray. Lightly mist the entire sofa, focusing on seams and folds. Follow the manufacturer’s drying time before allowing contact.
Create a barrier to prevent re‑infestation. Sprinkle a fine layer of diatomaceous earth on the sofa, let it sit for 24 hours, then vacuum again, sealing the waste as described above. The powder desiccates any remaining eggs.
Repeat the entire process after seven days. Lice eggs hatch within 7–10 days; a second treatment eliminates any newly emerged insects.
Maintain a clean environment. Wash household linens weekly, vacuum floors and upholstered furniture regularly, and avoid placing personal items (hats, scarves) on the sofa until the infestation is resolved.