To remove hair color using baking soda, mix together 2 tablespoons of baking soda and 2 teaspoons of lemon juice, adding the lemon juice until a spreadable paste forms. Apply the paste to the skin, if affected, or to damp hair, and let it sit for 10 minutes. Rinse the paste off the skin or hair with lukewarm water. Another option is to mix baking soda with a dandruff shampoo to remove hair dye.
Alternatively, purchase a hair color removal kit at a drugstore or other hair care product store. Using these within a day of applying the hair dye provides best results. The kit may require multiple shampoos before the color disappears and, if not used correctly, it can cause patches of bleaching on the hair.
For best results, call a stylist, and have a hair color removal treatment within two to three days of applying the hair dye. Sometimes the removal may require several visits, but if the stylist made the color mistake, he often does the removal for free.
An extreme way to deal with the unwanted hair color without using products or chemicals is get a short haircut to remove the unattractive or damaged hair. This provides a blank canvas as the hair grows out that you can color later.