What liquid can be used to wet lice? - briefly
«Lukewarm water» or a dilute mixture of water and mild shampoo can effectively wet lice for removal. Hot water should be avoided, as it may kill the insects and impede combing.
What liquid can be used to wet lice? - in detail
Moistening lice before treatment improves the penetration of pediculicidal agents. The following liquids are commonly employed for this purpose.
• Distilled water – pure, non‑ionic medium; eliminates residue from hard water that can reduce efficacy of topical insecticides. Apply with a fine spray, allow lice to become visibly damp, then proceed with the chosen pediculicide.
• Saline solution (0.9 % sodium chloride) – isotonic, reduces irritation on scalp skin. Mix 9 g of sodium chloride with 1 L of distilled water, stir until dissolved. Spray evenly; the solution remains on the hair shaft long enough for lice to absorb moisture.
• Diluted permethrin solution – commercial 1 % permethrin mixed with an equal volume of water yields a 0.5 % preparation that serves both as a wetting agent and an insecticide. Apply with a spray bottle, ensure complete coverage, leave for the recommended contact time.
• Medicated shampoo (e.g., containing pyrethrins or malathion) – formulated to wet hair while delivering active ingredients. Use as directed, typically by massaging into the scalp, allowing a brief dwell period before rinsing.
• Light mineral oil or olive oil – non‑volatile liquids that coat lice, facilitating suffocation. Apply a small amount to the scalp, work through the hair, and let stand for 10–15 minutes before combing and washing.
Selection criteria include safety for the scalp, compatibility with the subsequent pediculicide, and ease of application. Water‑based liquids are preferred for most chemical treatments, while oil‑based options are suitable when a mechanical approach (suffocation) is desired.