Baking Soda Wash + Vinegar Rinse. HAIR DETOX!! Wash: 1 part baking soda with 3 parts water (for shoulder length hair use about 2 to 3 Tbsp of baking soda with 3 x that amount of water ), let is work for 3 minutes. Rinse:1 part white or apple cider vinegar with 4 parts water ( to minimize the vinegar smell add some essential oils to the vinegar mixture).