To remove red from hair, you can try different methods depending on the cause and intensity of the red tones. You can use a green shampoo to cancel out the red pigment, a purple shampoo to counteract the red tones, or a white vinegar mask to neutralize the redness. You can also use a color remover to strip the dye from your hair, or a darker dye to cover the shades of red. If you want to lighten your hair, you may need to bleach it after removing the red color.