I have always used a Tea Tree or Lavender based shampoo on my son and thus far we have not had any.
However I am sure now i've said that out load it won't be long, there are so many treatments out there and although I haven't had to try them yet it is good to know about the ones that do exists and the methods you can use to get rid of them as well as preventing them.
This fab chart from Lyclear is really useful and has just about as much information as it is possible to cram onto a page, so I hope you find it as useful as I did.
PS Sorry if this has got you itching, just the thought of those little nasties gets me going.
NB: I have received no payment for this post, it was something that was of interest and I wanted to pass on to my readers :)