How do you take the color out of your hair if you dyed too dark?

if your want the color to be lighter then just take a shower or just wash your hair with regular shampoo. but dont leave the shampoo in for too long or it will take out to much of the color. use head and shoulders anti dandruff. I accidentally fell asleep with hair dye in and it turned black. within a week it was already mid/dark brown and three weeks later it is is light/mid brown.