How do I get permanent hair dye off a plastic bathroom sink?
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https://www.stain-removal-101.com/how-to-remove-hair-dye.html
I share your problem, what I did was bleach it with fresh lemon. Keep an eye on it though, allow enough time to just take out the stain.
Try bleach
Try using hair dye developer. Pour some on paper towel and wipe the sink out with it.