Switzerland is pretty clean, and it's largely due to the Swiss culture, and the fact that there's plenty of bins which are regularly cleaned and emptied.

However

There's one class of people who believe that it's their God given right to litter wherever and whenever they want, and that's smokers.

You can especially see it around Tram stops where people are waiting around and will quite happily throw their cigarette butts on the ground or pavement when the tram approaches.