It is evident that rats are so dangerous to be in your dorms as they can cause so many diseases such as leptospirosis (Liver and Kidney damage) and Lassa fever. To kill and expel them from your home permanently, you only need salts and detergents.
1. To kill rats, (use salts + de tergent + any food). Put in your cupboard or anywhere you detect rats.
2. To kill ants, (Use salts + detergent + water). Just spray it round your house or anywhere you see ants. The same thing works for cockroach.
3. To kill white ants (Ikan an), (Use salts + detergents + kerosene). Kerosene is used here to make it highly concentrated as the white ants are so stubborn. These are all I have tested and confirmed. Please, apply all these out of reach of children..