To dream of the color white is symbolic of exclusivity, the new world, appeal, protest, reform, miscarriage succession, virginity, purity, simplicity, justice, and innocence.
To dream of yourself whitewashing implies that you are trying to change your habits and ways. It may also imply that you are just trying to cover up your flaws and pretend to change.
To dream of a white moth foreshadows a sickness, possibly fatal, for a loved one.
To see a dream in black and white indicates your need for more decisive and clear action. Your subconscious is instructing you to conduct your waking life with more purpose and clarity and eliminate excessive gray areas.
Alternatively, noticing that you are dreaming in black and white and that your dream is rather dull, it may be your subconscious suggesting you to add more excitement or 'color' to your waking life.