Use a clarifying shampoo several times over a few washes
Apply a vitamin C and shampoo paste to damp hair, then rinse
Use a color remover made for permanent hair dye
Try a dandruff shampoo or anti-residue shampoo
Wash with warm water to help lift some pigment
Apply a deep conditioner after each stripping method
Repeat gentle methods over time instead of overprocessing
Avoid bleach unless you want a drastic color change
Get a professional color correction if the dye is stubborn
Do a strand test before applying any remover to all hair