I do not know for sure, but try a little bit of rubbing alcohol and see where that gets you.
PS: I find using nail polish remover or a bit of rubbing alcohol helps get rid of the dye splotches X3
Man I love this ;-; It's so bright and colourful! But it's still soft <3 I love it, well done!
I found that either nail polish remover (be sure to be careful with this) or toothpaste works well to get dye from skin.
Also, for the hair dye on your head, give it a good ol' wipe with a tissue that's had some vinegar on it. Always works for the hair-dye crazy family here. c:
Maybe scrub it harder with some kind of strong soap?
And for the splodge; It should be gone in a few days if you aren't able to wash it away with the first try. I dyed my hair brown a few times already, got a splodge too and about 2 or 3 days later it was totally gone. xD
BTW l love the colours u used in this <3