In fact, it’s healthier for your hair to be a little oily when you bleach. Don’t wash your hair for two or more days before bleaching.. 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.
Is it better to bleach hair when it’s dirty?
The preparation process is hugely important. If at all possible, begin the process with dirty, oily hair (yes, really!). Don’t wash your hair before bleaching it, not the night before or even two days before, because washing strips the hair of its natural oils (yes, even with the gentlest of shampoos).