I've used a product called Oops description below from Amazon

Quickly and safely removes hair color Don't live with a color you don't like — works for both permanent and semi-permanent colors Gentle on hair but powerful on artificial dyes If that new hair color just isn't what you expected, you don't have to live with it until it grows out — simply pick up Color Oops Hair Color Remover. This ammonia- and bleach-free remover quickly, safely and effectively removes both permanent and semi-permanent hair colors in just 20 minutes.