One of the many awful results of the Balkan wars and genocide of the 1990s was the spread of a racist term: "ethnic cleansing."
No one should use it.
It implies that the victims are not just dirty, but dirt. It forces a listener to figure that out in order for the term to make sense. That forces the listener's own brain to make a racist connection, making it harder to fight back against the insult.
It was used ironically, but now people just say it. Don't
The term is genocide.