In a small squeeze bottle, mix baking soda and water in a 1:3 ratio. Adjust the dosing according to the length of the hair. For instance, in the case of shoulder- length hair, you should use 1 tablespoons of baking soda, and 6 tablespoons of water.
You can apply this mixture to a dry or wet hair, from the roots to the ends of the hair. Leave it to act for a couple of minutes, and then wash it off with warm water. You may find it strange that it does not foam at the beginning, but you will get used to it.
Then, rinse the hair with a solution of apple cider vinegar and water, in a 1:4 ratio. You can add a few drops of your favorite essential oil. Make sure you apply it properly, tilt the head backward, in order to avoid any contact of vinegar with your eyes. You can prepare this rinse beforehand, and store it in a small squeeze bottle in the bathroom, and use it whenever needed.