Hi Lisa
Whats going on? If it's not one thing it's another!
Maybe I can help with this one. We seem to have quite a problem with this at our kids' school. So I have tried all the various options. This is my favorite one (but I'm sure you'll have a hundred postings like this by the end of the day!!):-
Many of the prepared aromatherapy oil blends have NEEM oil (along with Tea-tree and eucalyptus). I have bought Neem oil at the local alternative health shop. It is not mixed with any thing else. It smells of rancid barbequed chicken! But I don't think it will antidote anything.I mix it with cheap cooking oil (eg. grapeseed) and a few drops of lavender and geranium essential oils for improved scent!
I apply it to their dry hair at night (very liberally and massage it into the roots). They sleep on a towel! In the morning it is relatively simple to comb through with the fine toothed nit comb. All the unwelcome visitors leave without a fight! Oh yes and then shampoo as normal (!!!).
I'm sure you know that this has to be repeated until their life cycle has been broken and all that! It's just a matter of finding something that doesn't contain pesticides and which doesn't antidote...
Happy bugbusting!

Debd