Lyclear Crème Rinse is head lice treatment that works by killing head lice and their eggs. Lyclear contains the active ingredient Permethrin which is an effective insecticide that can stop infestations and prevent spreading. One bottle is usually sufficient to treat one person with shoulder length hair of average thickness. The easy-to-use formula is simple to apply and can kill head lice and their eggs in 10 minutes. If one member of the family needs treatment it is important to check the rest of the family and treat them if lice are seen.