Changing Hair Dyed Dark Brown to Blonde?

I had my hair silver and then I tried going lavender. It failed, I got mint green. After I put dark purple on to hide the green, but the dark purple kept fading so I went dark brown. I see no more green, but my hair has some light shades of brown because I was letting the darkness fade. My question is, do I have to remove the previous colors in order to go light blonde again?