Washing powder itself isn't enough to kill cockroaches, and the cause of the cockroach's death is that it runs into the foam of the washing powder and is blocked and suffocated to death. "However, washing powder is fat-soluble, and the cockroach body has the wax layer, and the body surface grease is buried in the washing powder. It can also cause the death of body flooding. 1, haunts the cockroaches like hiding places, such as cabinets, glass, under the table, and a dark corner, diluting the detergent water, dry the surface of the place, reoccupy dishcloth touches cockroaches will be moved, ran away. 2. When confronted with a cockroach, spray the body with detergent water, and the cockroach will soon die. 3. After removing or killing the cockroach, the places should be kept dry and clean. Because cockroaches live in moist environments, be careful not to have any leaks, especially in the kitchen. So the cockroaches will not be patronizing our lives.