How would someone go about accomplishing this goal?
I got hair dye on my clothes, so how can I get it out?
Older, set-in stains will often come out in the wash after being pretreated with a solution of 3 tablespoons white vinegar and 2 tablespoons liquid detergent in 1 quart (1 liter) warm water. Rub the solution into the stain, then blot it dry before washing.