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Just keep washing it over and over again! Shampoo's such as Vosene/Head & Shoulders or any type of purple shampoo will fade the hair dye and quicken up the process. Hope this helps :)

Get highlights or even get it dip-dyed or get an all over shade at the hairdressers of your preferred shade

Let it grow out is the only option if you want to do it properly but Head & Shoulders and any type of purple shampoo's and conditioners do the job as well. Hope this helps!