To disregard one's own culture is to be whitewashed. You do this in order to make way for a new culture. Just as you whitewash a wall to remove the original color, you then paint it a new color. White wash is to make way for something new.
The Irishman moved to Japan and became white washed and then adopted a new culture to him.
..... that thing government/ civil servants and fake advocacy do that reflects the 'whiteness' of politics and all of its oppressive and exploitative practices. One does not need to be Caucasian to be a whitewasher...metaphorically those who paint over messes with a distracting white wash so there is an appearance of cleanliness, resolution and organization. The mess still remains under this thin coat of deception.
The Catholic Church tried to whitewash the sexual abuse charges by offering out of court settlements