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How to get rid of rats in apartment buildings
Use wooden snap traps.
You will need to make sure that your traps are big enough for a rat. You can buy larger traps or make the trigger of a small trap bigger by attaching a 2-inch (5 centimeters) piece of cardboard to it.
The cardboard will trigger the trap if a rat steps on it. You can also try a wooden snap box trap, which is better for outside.