Disney's legendary cleanliness is the result of a rigorous, multi-layered strategy that has been a core tenet of the company since Walt Disney opened Disneyland in 1955. The most visible part is the Custodial Cast Members, who are trained to be "24/7" responders to spills and litter; they use specialized "trash pans" and brooms designed to be used without bending over, allowing them to maintain eye contact and greet guests. Behind the scenes, the parks undergo a massive overnight transformation; once the gates close, a "third shift" of hundreds of workers pressure-washes the streets, steam-cleans the restrooms, paints facades, and replaces worn-out landscaping. Disney also uses "psychological" cleaning, such as placing trash cans every 30 steps to discourage littering and using "Pumping Scents" to mask odors. Every detail, from the polished brass railings to the lack of chewing gum for sale in the parks, is part of a "Total Quality Management" philosophy designed to maintain a pristine, immersive environment that makes guests feel they are in a magical, cared-for world.