Colour remover again. The darkness in your length is dye. You can bleach it out if you're lucky but most likely you will fry your hair in the process, especially considering you're going silver. Also, colour removers, NOT strippers. Colour removers are drying but not damaging outside of that. Also, shampoo your hair a few times before going at it with bleach/dye after colour remover. If there is any dye left, even if your hair seems light, the peroxide can cause it to re-oxidise.
If you haven't found it already, hairdyeforum is a great resource. Check out the masterposts on home bleaching and colour removers.
Honestly, I would back away now. I'm saying that as someone who went that exact route, from dyed dark hair to light blonde. I did eventually get to my goal colour, but my hair was fried, falling off, and the colour was uneven and took toner differently depending on how damaged it was, so I was left with yellow roots and purple lengths, even after "spot treating" it. I quickly got sick of the upkeep and decided to dye it darker again, and with the unnevenly damaged hair holding onto dye differently I now have almost black lengths, a weird reddish mid length that flares blonde, and then my brown virgin roots. The worst part however is the difference in texture. The bleached parts don't act like hair, if that makes sense. It's stiff and gross and dry even after tons of conditioners and oils. My virgin hair, I only shampoo it and yet it's shiny and smooth! The difference is driving me crazy and if it weren't for buns, I would probably get a boy cut already.
Going Platinum will damage your hair when done in a salon on virgin hair. It's possible to do at home, but chances are it will be unneven and very damaging, especially with previous permanent dye. With your hair already showing signs of being stained from the colouring (the dark ends and the greenish tint) I would really, really recommend you stop now before it's too late, or at least go to a salon. If you are hellbent on doing it, try colour removers before, let them work for a long time and rinse until you never want to shower again, and when you bleach, go SLOWLY. Seriously. Put away the 30vol developer. Use protein treatments in between and baby your hair. It's tempting to dye it to a more pleasing colour in between bleachings but don't, unless you use true semis and conditioner (and be aware these can stain if you're unlucky).
I hope I don't come off as mean with saying you should back off, it's just that I've done that exact thing and I'm paying for it big time. I wish I could go back in time and pry that bleach out of my hands!
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