Make your own baking soda shampoo even easier.

Start by mixing 1 part baking soda with 3 parts water. You can adjust this depending on your hair length.
Apply the baking soda and water mixture to dry or wet hair by starting at the roots and working to the ends.
Let it sit for 1 - 3 minutes then rinse with warm water.
After washing and rinsing with the baking soda mixture, you'll want to apply a vinegar rinse.

Vinegar Rinse

Mix 1 part white or apple cider vinegar with 4 parts water. To minimize the vinegar smell, I add lavender, peppermint, and/or rosemary essential oils to the vinegar mixture. I like to mix a big batch of this ahead of time and keep it in a squeeze bottle in the shower.

Tilt your head back, close your eyes (to avoid getting this mixture in your eyes), and distribute through your hair.

After a few seconds, rinse with cold water. The cold water helps to seal in moisture, smooth the hair, and add shine.

Cheers