Mayonnaise is a home remedy believed to suffocate adult head lice and nymphs, according to Health.com and the HeadLiceCenter.com. Mayonnaise contains oil, vinegar and egg yolk. Some users believe that mayonnaise kills the head lice but does not affect the eggs, because the vinegar concentration is too weak.
To remove head lice with mayonnaise, the affected person much coat the hair and scalp with the mayonnaise, and cover the head with a shower cap or plastic wrap, explains Health.com. The treatment should remain covered overnight. The next morning, it is necessary to thoroughly shampoo the mayonnaise out of the hair and use a nit comb to remove the dead lice. Two options at this point include either waiting a week and repeating the treatment to kill any hatchlings, or using a vinegar treatment to kill the live eggs.