1. Are you specifically against UP-wallahs and Biharis because, as you allege, they spread "filth"?
2. Or do North-Indians in general spread filth?
3. If any of the above is true, can we assume that you have no problems with South-Indians? Does it mean that you are okay with South Indians coming to Mumbai?
4. When you say that outsiders are a menace to Mumbai, what exactly do you mean? If a Maharashtrian living in Nashik comes to Mumbai to earn a living, would he qualify to be called an "outsider" and, in effect, spread "filth"?