J.S.
Soak hair with olive oil then cover with a plastic shower cap for 3-4 hours, blowing drying with hot air every 30 minutes or so to heat up the oil. It will be messy but it will work!! You can sleep overnight in it but I did not.
Wash hair with Dawn dish soap or another soap made for cutting grease...you have to get the olive oil out somehow. Once washed, use a straight white vinegar rinse. Let the vinegar set on hair for about 5 minutes then wash as normal.
Not only will your hair be soft and clean as never before, but the lice will be gone. The oil clogs their breathing up and the vinegar eats away the glue they use to stick the hair follicle. My son had a bad case a few summers ago and I ended up with them as well. I had hair down to my mid back at that time so it was expensive but then I found this treatment and tried it out. It worked!!!
J.