1. Put a piece of sweet flavor of biscuit bait or other food at bottom lure cockroaches.

2. Cockroach will go through the trap door for the biscuit, then be trapped. They would send a signal to lure more cockroaches in.

3. Before the cockroach die, don't separate cover and the seat, prevent cockroaches escape.

4. After cleaning the dead cockroach up, clear the machine once again with boiled water, expose to the sun and prepare for the next time.