Hop in the shower and wet your hair. Pour some clarifying shampoo into the palm of your hand. A dime-sized dollop will do for short to medium hair, while long hair will need a dollop closer to the size of a quarter.
Rub both palms together to evenly distribute the shampoo. Now begin to wash your hair, rubbing the shampoo over all areas of your head. Once you transfer the shampoo to your hair, begin massaging it with your hands.
While lathering up, keep your focus on the hair, not the scalp. It's natural to spend most of your time massaging your scalp with your fingertips when shampooing, but in this case you need to aim your attention at the hair itself. Gently but firmly massage your hair in your hands, working from the root area all the way down to the ends. Keep at it for at least two minutes.
Let that shampoo sit on your hair for one more minute before you rinse. You want to give it ample time to penetrate your hair and lift as much of the demi-permanent color molecules as possible.
Rinse your hair. Turn up the temp of the water to as warm as you can stand it (but not hot enough to burn!). The warm water will help to open the hair's cuticle and rinse away the color.
Apply a small amount of moisturizing conditioner to your hair and massage it in. Let that sit for one minute, then rinse. Keep up with conditioning during this fading process, because clarifying shampoos not only strip your hair of color and product buildup, but take every last drop of natural oils as well.
Repeat the clarifying process two to three times each week until your demi-permanent color is faded to your satisfaction or gone completely.
If you need to get rid of that color like yesterday, try an oxidating hair color remover. These color removers work with no ammonia or peroxide and remove only artificial hair color, leaving your natural color alone.
This much clarifying can lead to a case of dry hair. If you feel your hair getting a little straw-like, give it a deep-conditioning treatment once per week.