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Try acne cream, OP.
>Place a liberal dollop of acne cream on affected area.
>Place figure on a window sill with plenty of sunlight hitting the affected area.
>Wait a day or two.
>Wipe off acne cream from figure.
>????
>Profit!
I've done this technique on several different types of plastic. It works the best on sharpie marker ink on vinyl. The chemicals in the cream suck out the ink when activated by the sunlight.
It's not 100% effective on different types of plastic & ink/paint stain combos, but the acne cream won't damage the plastic if it doesn't work. It's worth a shot.