One of the most popular hair remedies is mayonnaise. This may sound a little strange, but trust us it works. Mayo is filled with amino acids that will have your hair looking shiny and healthy. Just apply mayonnaise to wet hair like you would with a conditioner. Then wrap your hair with either plastic wrap or a shower cap. Let the mayo sit in your hair for about 20 minutes, then rinse. After you’ve rinsed the mayonnaise out, wash your hair as usual.