Mix 1 tbsp. baking soda with 1 cup warm water in a spray bottle. Shake well to mix.
Spray some of the baking soda mixture on your scalp and then use your fingers to massage it in well. This will also get your hair follicles to release natural oils, which are good for your scalp and your dreads.
Rinse well with warm water. Don't worry about applying the baking soda shampoo to your dreads, since they'll get clean as the mixture rinses down.
Mix 1 tbsp. apple cider vinegar with 1 cup warm water in a new spray bottle and shake well to mix.
Spray the apple cider vinegar onto your scalp and rinse with cold water. The apple cider vinegar rinse can be used every 2 to 3 times you wash, not every time.
If you develop an itchy, flaky scalp, create a mixture of 1/2 cup warm water and 1/2 cup white vinegar and spray it onto the scalp. Rinse and use the baking soda shampoo to clean.