Quote from Emergent
One treatment that helped our family with a lice problem, when my girls were young, was the Vaseline treatment. We were having a stubborn case. I forgot the timing on it, it's on lice websites and based on the life cycle. You cover the whole head with Vaseline down to the scalp. Then you put a shower cap on and sleep in it. It smothers the living lice. Of course you remove as many nits as possible.
Then you do the same in a prescribed period of time, when any unfound nits may have hatched. It's non-toxic and the lice can't become resistant like they do to the poisons.
Lice do not like grease or greasy hair. I've read that people of African descent, with kinky hair, do not get lice as much because their hair is naturally more oily. The nits don't find that as hospitable.
1) I do not recommend to my parents to use Vaseline because it can be difficult to remove from the hair and can make nits more difficult to remove as well. The CDC, NASN, and the American Academy of Pediatrics do not recommend so-called "home remedies" as they are not as effective in treating and removing lice, especially in cases of students with chronic head lice.
2) Resistance lice isn't as common and usually happens when parents do not read in instructions and shampoo the child's hair everyday or other means of overusing the products.
3) Lice considers any and all heads as habitual. As an African American person with "kinky" hair I feel the need to personally speak on this myth. Lice can, and will affect oily or kinky hair as much as other types. Cleanliness and hair type has nothing to do with it. Although it has been shown lice is less prevalent in African American communities or households, but hair type has been prove as an ineffective repellent to lice. 2 of my little cousins just got lice from an outbreak in their kindergarten class (they're twins). Their hair looks just like mine.
The NASN has some great information about lice information and myths if you would like to do some further reading:
NASN | Lice Lessons