What Is Best For Removing Manic Panic From Hair?

My hair is slightly less then virginal. (And, by that I mean I’ve been dyeing it pretty regularly for the better part of 20 years.)
I went with several different shades of blue by Manic Panic a few months back, and it’s barely faded. (I wash with conditioner since my hair is curly so the fade isn’t bad.)
However, I have a funeral service for my father this weekend. I asked my mother, and while she doesn’t mind she’d just rather not have to deal with people giving me or her dirty looks for having my hair blue. It told her that as long as she doesn’t care they can give me all the dirty looks they won’t. I’m the one grieving here. But, just to put her more at ease I’ve decided to go forward with my re-blondeing plans.
I’m going back to my natural blonde, but it will obviously be a bit lighter.
I needed to know what is the quickest one-shot way to get the blue out since it’s still barely faded. Will their flash lightning work really well at getting it all out or should I go for a ‘regular’ bleach? After the service I’m going to do it green again, but I doubt that really matters as far as the removal goes right now.
If neither of them are good or atleast moderately gentle on my hair (I get that it’s bleach either way, there is no gentle way to strip your hair of colour) what other ways have you had success in removing it from your hair? Any tips would be greatly appreciated since I only have 3 days to do this, and a lot of other things to do. So, sitting at home washing my hair over and over is not an option while we prepare for the service. Again, thanks in advance.