Depending on the length of your hair, combine 1-2 tbsp. baking soda with 1-2 cups warm water in a glass jar and pour over wet hair in the shower, gently massaging to distribute the baking soda evenly. Rinse both hair and jar thoroughly. Next, combine 1-2 tbsp. apple cider vinegar with 1-2 cups warm water in the glass jar and pour over your head. Rinse immediately.