I live in Japan, and its known as one of the cleanest countries in the world. The culture of "clean up after yourself" is strong here. Children are thought from elementary school to clean up after themselves, and they even clean their own schools.
With a lack of garbage bins around the city, stores like 7-11, Circle K, Family Mart and so on, are popular garbage disposal places. I mean, if I buy something in a package, like a sandwich or a drink, and am finished with it, I will either discard it at a store, or take home with me to recycle.
Most Japanese are the same way. There are the few odd-balls who just throw trash on the side of a street, but the other 99.9% of Japanese discard of trash in a thoughtful manner.