Disney's legendary cleanliness is the result of a "multi-layered" and highly disciplined operational strategy. The most famous element is the Utilidor system, a 12-acre network of tunnels beneath the Magic Kingdom in Florida. These tunnels house a massive Automated Vacuum Collection (AVAC) system, which uses pneumatic tubes to suck trash from processors throughout the park to a central location at speeds of 60 mph. This ensures guests never see smelly trash bags being hauled through the streets. Additionally, Disney follows the "20-foot rule," where trash cans are placed exactly every 20 feet (a distance Walt Disney personally tested by watching how long people would carry trash before dropping it). After the parks close, a "Third Shift" of hundreds of custodians performs a total "deep clean," steam-cleaning the pavement and even hand-painting any chipped railings. This supportive "backstage" effort ensures that when the gates open the next morning, the "illusion" of a pristine, magical world is perfectly restored.