Don’t wash your hair the day of the appointment. In fact, it’s healthier for your hair to be a little oily when you bleach. … Bleach, unlike some hair dyes, does not need to go on clean hair. Having dirty hair isn’t going to stop the bleach from distributing evenly.
Does bleach work better on unwashed hair?
“I usually recommend unwashed hair for bleaching processes, ” says celebrity hair colorist Jeremy Tardo. Laura Estroff, hairstylist at The Factory Hairdressing, agrees, saying, “This is a big no-no! The oils from your hair help to protect your scalp during the bleaching process.