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In a plastic or glass bowl, stir together baking soda and shampoo in a 1:1 ratio. To ensure you make enough to cover your dyed hair, measure out the amount of shampoo you would normally use in the shower and then add the same amount of baking soda. Anti-dandruff shampoo is said to work best because of its high pH, which fades hair dye. However, you can also use a clarifying shampoo instead. Using the paste in the shower will make it easier to apply without worrying about making a mess. Set the paste aside while you soak your hair with warm water. Scoop some paste into your hand and start working into the hair where the dye starts. Use your fingers to work the paste down toward the tips, adding in more paste as needed, until you’ve covered the entire dyed section of hair. You don’t need to apply the paste to your natural hair, just the Kool-Aid sections.  If your color starts at the roots, make sure to start working the paste in at the roots and work all the way down to the tips of your hair. If only your tips are dyed, start applying the paste an inch or two above the dyed section to make sure you don’t miss any of the color. Unlike the hot water and baking soda method above, this method is safer to use on the scalp. Set a timer or have someone else set a timer for you so you don’t accidentally leave the paste into for too long. Stay in the shower while you wait, and either turn off the water or keep your hair away from the water. Once the time is up, rinse the paste out in the shower. Use the hottest water you can tolerate to help draw out the color and keep rinsing until all of the paste has been washed out. This method is also drying, so remember to always deep-condition after rinsing out the paste. Work a deep conditioner through your strands, focusing on the tips. Let it soak in for 15-30 minutes, then rinse it out with warm water. Be sure to rinse your hair with cool water to seal the cuticles. After 1 round of this treatment, the Kool-Aid color should be significantly faded. However, it may take several repeat washes to completely remove the dye. Use the paste once a day for several days, deep-conditioning after each wash to replenish and re-hydrate your hair.
Mix equal parts baking soda and shampoo together to form a paste. Take the paste into the shower and wet your hair. Work the paste into your wet hair until it lathers. Let the mixture sit for 2-3 minutes. Rinse the paste out with hot water. Apply a deep-conditioning treatment to rehydrate your hair. Repeat the process once a day for up to 2-3 days.