Ohh...these sound like a sure-fire way to really dry the hair out. (Vodka being high in alcohol and lemon juice being very drying) And I'm not sure how well they would remove henna (and especially indigo!)
There is a thread on here about henna removal with ColorOops (Thread here), but I have never heard of a method to get rid of indigo successfully. I have done the ColorOops method on 2-step henna-indigo hair, but it really didn't do that much, if I remember right.
Bleaching really won't touch indigo (ask me how I know lol), and all it can really do is lighten the color underneath henna (which I've done before with success when my henna went too dark).
I'll be curious to hear if anyone else chimes in, though!
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