Why are these bridges washed so thoroughly

[0:00]This is probably the only job in the world where the salary directly depends on someone else's fear. In China, there are cleaners who polish the glass floors of bridges hanging over a precipice at an altitude of more than 1,500 feet. While tourists are barely moving their feet, clutching onto the railing, these people are calmly working with a mop. And the more visitors the fear engulfs, the higher their salary. It's simple, the more transparent the glass, the stronger the feeling that a person is walking through the air. The effect of emptiness underfoot is truly terrifying. Tourists often freeze and cannot move and start to panic, and the cleaner gets a bonus at that moment. If no one gets scared within three days, the bonus burns out. So they are interested in the perfect cleanliness of this transparent bridge. Bonuses for such bridge cleaners can exceed $5,000 per month. The most amazing thing is that special effects are added on some bridges. Artificial cracks begin to open underfoot, and even the brave ones cling to handrails. In these places, the salaries of cleaners are always high. Despite the fear, thousands of people come to these bridges every day. Someone wants to test themselves, someone wants to take a spectacular photo, and someone just wants to overcome their phobia.