Find a dormitory, and finally leave the dormitory when everyone goes out to class. Sprinkle some safflower oil on the electric mosquito-repellent incense, and then electrify it. Two hours later, the cockroach left in disgust. I took such precautions in the rented house. I lived in a shady hut for more than half a year. Since I lived there, cockroaches have never bothered me again.

In addition, be sure to pay attention to the hygiene under your bed or bedside table. Any boxes and books will become their habitat, especially under the cabinets.