Go to headlice.org and read through their information.
We haven't ever used any product and I get rid of head lice quit easily. I use normal shampoo, then condition, comb through the hair to de-tangle it then rinse the conditioner out, leave the hair dripping wet.
Then I use a magnifying headset and go through the hair rather quickly. Wet hair, room temp, it's too cool for the bugs and they can't move quickly. So they are very easy picking. I drop then into a cup holding plain water.
I use my nails to remove the nits that have a black center. The white ones are empty shells and are nothing to be concerned about.
I do this a couple of times that first week and usually by the first time or two there are no more to be found.
I only run the vacuum over the furniture and I wash the sheets on normal temp water. The dryer is what kills the bugs and eggs. I don't even use high heat either.
I vacuum the car seats and that's pretty much it. I do wash the coats or winter gear though. But as for bleach or crazy stuff or buying all those lice prevention products, they don't work and it's a money making racket.
You can prevent head lice too.
Get some Tea Tree Oil from the ethnic hair care isle, it's only a couple of dollars. Then get a small, 4 ounce to 8 ounce spraying water bottle. Put a few drops in the bottle and add some water.
Shake it up and spritz the kids hair each morning as they're getting ready for school. The water will help the hair look tidier and the oil will repel the bugs.
Head lice only like clean people and very clean hair. They can't grasp or crawl easily if the hair is dirty. And they can't get their eggs to stick to it either.