hopefully I am posting this correctly. new to web list and got this in digest.
Now I am posting what may will call extreme measures. However I have had lice only 2x in My home in 20 years.
Both came in with small children who let their hair be played with by class or church mates. I am extreme on some areas (however lice / nits are gone with in 2-4 days and no return ) and the life cycle of the lice/nit is destroyed by ether killing the adult or nit or keeping the nit from hatching.