Mayonnaise can be a deep moisturizing treatment for hair that is dry, coarse and thick. For people with fine hair, this may not be a suitable conditioning treatment because it causes this hair type to become limp and greasy-looking.
For a mayonnaise treatment to work, it is important to start with damp hair and then apply about a cup of mayonnaise to the scalp and hair from the top to the ends. After massaging the mayonnaise into the scalp and hair, leave in the treatment for at least 20 minutes before rinsing it out and using a moisturizing shampoo.
Besides adding moisture and shine to the hair, some other benefits of a mayonnaise treatment are the restoration of pH balance, prevention of hair breakage and as protection against the effects of the sun.