I remember the first time I saw a cockroach in my apartment I was terrified of it and of being called an untidy person. After a short time that fear faded and every time I saw one I immediately went on the war path.

Kill the roach, find where it came from, patch the hole, vacuum the area, wash the area, spray the area, triple check there’s no food or dampness for them to live on. It was work but my unit had far fewer cockroachs than many other units.