Lice home remedies that actually KILL lice AND their eggs?

Ive used shampoo and lice conditioner and the comb, but they just put the lice into a nice little nap, so if i dont get all of them off theyll wake up nice and hungry. anyway i was going 2 go to the beach and wash my hair in the salt water but if theres anything that will actually KILL the lice AND their nits plz do tell(home remedie)