What is the best way to get rid of head lice?

my little sister has had head lice for a very long time. we've tried everything from using over the counter lice shampoos, lice combs, mayonnaise, bed spray, and many many other things to try to get rid of it. once we think it's gone, it just keeps coming back. it's so bad, it's now getting to... show more my little sister has had head lice for a very long time. we've tried everything from using over the counter lice shampoos, lice combs, mayonnaise, bed spray, and many many other things to try to get rid of it. once we think it's gone, it just keeps coming back. it's so bad, it's now getting to everyone else in my house. is there a way to get rid of the lice?
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