How long since you indigoed? For some people indigo fades substantially enough over several months that you might not even have to bleach it out. (It usually seems that these are the people who want permanent and deep black, of course, while the people who wish it would fade have uncanny permanence.) You might get lucky and have the indigo fade without having to deal with bleaching and green hair.
You might also look at the whole ColorOops/ColourB4 removing indigo thing that's happening around here. It seems to have a lower risk of green hair than bleach does.
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