1. First, mix a bit of water with the baking soda to create a paste of sorts. Rub the paste directly onto your scalp. Rinse.
2. Then, pour the apple cider vinegar into a cup with about 1/4 cup water.
3. Pour this mixture over your hair. You can let this sit for a few minutes. Rinse with water.
Depending on how long/short your hair is, you may have to increase/decrease. This always leaves my hair soft and very clean, without damaging it with too much cleansing.
If your hair gets dry and frizzy, reduce the amount of baking soda. If it seems oily, increase the amount of baking soda. You may notice your hair looks/feels different for the first few days, but your scalp will adjust!
This is the best method for washing my hair I've ever found. I hate the waste associated with all the organic shampoos and conditioners out there.