As a chef if you think thats bad, it's worse when you're a landlord. I had leased out my shop to a Chinese hotpot restaurant. This tenant had ZERO care for hygiene and cleanliness. When their lease was up and had to move out, they cleared up everything except the false plywood columns they constructed during their renovation for power sockets. I pried open one electrical socket and out comes a whole swarm of baby cockroaches flying out, its like those movies where you have an alien invasion. When I tried unloading a whole can of bug spray into that outlet, more of them started swarming out and it was a never ending battle. Lesson learned, I'm never renting out to any restaurant ever.