yes they do go for clean hair. don't spread misinformation. also, DONT wash your hair with nit stuff too often. they build up resistance. when i got nits i think they already had resistance because although i was careful not to use it too often they just wouldnt go. i blasted them with different varities, alternative therpaies, cutting hair, straight coming through and 3 years later i still had them. i couldnt just not go to school so i had to be very careful to prevent other people getting them. eventually i think they just died out of natural causes to be honest. i'm not saying this will happen to you -you should just put it into perspective. by the end of it i wasnt really bothered.. nobody knew because they are so small, and it was just personal embarassment because they're crawly things whereas if it was something like an ear infection yoyu couldnt get rid of it wouldnt 'seem' so bad, when they're basically the same sort of thing - an infection.