Well, Try a lemon juice, it sounds silly I know, But it will gradually lighten it, do not expect it to go blonde in 30 minutes. Try getting it lifed, using a Hydrogen Peroxide. It may make your hair go orange, use a toner(violet takes out brassiness) if this happens. Leave it around 1-2 days, using conditioner on each hair wash. Then dye it using any normal hair dye to your natural hair colour. Remember, when chosing dye, Go for the one labbled N= Natural. Not A=Ash. Ash will make your hair look cheap, and un proper. Natural will make your hair easier to dye to your original colour.
