How do I bring my hair back to blond if I died it dark brown?

Hey well I've been there and your hair is going to end up like mine. Its now dead, blondish whitish and dry as. I went to the hairdressers each 3 months. They told me the best thing is to use bleach and something else. My hair was dark brown - then red - then orange - then dark blonde - then blonde. Then I used my own toner at home. Consult your hairdresser first and remember to use treatments all the time whilst your hair is being processed, Use moisturisers and anything you can find. PS. AVOID STRAIGTENING IT. I DO AND MY HAIR IS DEAD LOL. OH WELL. :(