How can I go back to blond?

My hair was blond on the side just like the girl that sings that song Jar of Harts. I accidentally died some of the blond a light mocha color and I want my blond back. I thought I would use a color corrector on the part that was already blond before, then bleach with a 10 if I had 2. Only problem I not sure I should do it cuz my hair was a platnum blond and my natural hair color is dark brown. What should I do? Also i just did this to myself yesterday.