I got tired of treating my kids with expensive chemical treatments that don't work and endanger their health. I did some research and came up with a solution that is both inexpensive and safe.
Mayonaise--completely saturate your child's [dry] hair with any full fat mayo. Cover with a regular plastic beauty cap such as you would find at a beauty shop OR use one of the larger Plastic bowl covers with the elastic [Saran Quick Covers] and leave to sit for 2-3 hours.
Wash out using Dawn dishwashing liquid [you may have to wash hair 3 or 4 times, but it's worth it.]. The oil from the mayo also helps make nit removal very easy comparitively. Works much better than Clear Nit Remover.