Try just using a thick white conditioner, leave it in for a while then comb with a nit comb. Another joy of teaching isn't it LOL I got them my 1st year,I nearly died cause I had gone all through school without them.
I used a spray which was 100ml water, 5 drops lavender, 5 drop tea tree and 5 drops eucalyptus to put on my hair as a preventative measure when we lived in NT.