Pick any carrier oil of your choice. Mix 5-6 drops of need oil with 1-2 tablespoon of the carrier oil. Apply the mixture to your scalp and hair. Leave it on for at least 30 minutes and rinse off.Since neem oil is an antimicrobial it can be used to eliminate the constantly replicating microbes that cause your scalp to smell bad.

Mix two teaspoon of lemon juice in 1 cup of warm water. Wash your hair as usual with a mild cleanser. Give a final cleanse with the lemon water. Leave it on for a few minutes. Rinse your hair thoroughly with plain water. The bactericidal effects of lemon may help combat the bacteria that are causing your hair to smell bad.

Mix half a cup of apple cider vinegar with 2 cups of warm water. Give a final cleanse to hair with this mixture after washing hair with a mild cleanser.Rinse your hair thoroughly with water after this. The antibacterial nature of apple cider vinegar can help combat the bacteria thriving on your scalp