How to properly treat a house for lice? - briefly
Wash all clothing, bedding, and curtains in hot water (≥130 °F) and dry on high heat, then vacuum carpets, upholstery, and cracks, applying an EPA‑registered lice insecticide to baseboards and furniture; repeat the process after 7–10 days to eliminate newly hatched nits.
How to properly treat a house for lice? - in detail
Effective elimination of head‑lice infestations from a home requires a systematic approach that addresses all potential reservoirs. The process begins with identification of infested items, followed by targeted cleaning, chemical or non‑chemical treatment, and verification of success.
First, isolate clothing, bedding, and accessories that have been in contact with the host. Place each item in a sealed plastic bag for 48 hours to deprive lice and nits of the temperature and humidity needed for survival. Items that cannot be bagged should be laundered immediately. Use hot water (minimum 130 °F/54 °C) and a high‑heat dryer cycle lasting at least 20 minutes. For delicate fabrics, apply a steam‑press or hand‑wash with hot water, then dry on the highest safe setting.
Second, treat the indoor environment. Perform a thorough vacuuming of carpets, rugs, upholstered furniture, and mattress seams. Dispose of vacuum bags or empty canisters into sealed trash bags. Follow with a steam‑cleaning session on all fabric surfaces, ensuring steam reaches a temperature of at least 212 °F (100 °C) for several seconds per spot. For hard surfaces, wipe with a solution of 0.5 % permethrin or an approved insecticide, adhering to manufacturer instructions regarding contact time and ventilation.
Third, consider non‑chemical alternatives where chemical exposure is undesirable. Apply diatomaceous earth lightly to carpet edges and crevices; leave for 24 hours before vacuuming. Use essential‑oil‑based sprays containing 1 % tea‑tree oil, applied sparingly to non‑porous surfaces, with a minimum of 30 minutes exposure before wiping clean.
Fourth, conduct a post‑treatment inspection. After 24 hours, repeat vacuuming and steam cleaning of high‑risk zones. Re‑wash all previously treated textiles using the same hot‑water protocol. Monitor for any remaining live lice by inspecting hair and scalp of affected individuals daily for a week.
Finally, implement preventive measures to reduce recurrence. Store infrequently used clothing in sealed containers, maintain regular vacuuming schedules, and avoid sharing personal items such as hats, combs, or headphones. By following this comprehensive protocol, a residence can be rendered inhospitable to lice, eliminating the infestation and minimizing the risk of re‑introduction.