If you are interested to know about a city in India, which is the cleanest, the most beautiful and well-maintained, I would name Pelling. It is city in West Sikkim. I am speaking about this, because I have witnessed myself how they keep it clean.
I have seen the people there who never disobey the rules. They love their place, they can't see it dirty. Thousands of visitors go there, scatter litters. They don't blame them. I have seen people from higher status coming on the road, to pick those litters themselves. The government there kept a rule of cleaning drive every day in a week, by several sectors.
One day is for the adults, one day for the students and so on. Then the same thing repeated area wise.
Sikkim has banned plastic for decades. you don't find anything in plastic, when you purchase anything from the shops, except for water bottles. They have kept beautifully knitted dustbins all over their city, one in every couple of yards.
Sikkim is 100% organic. So, they don't let the ingredients of pollution and litter grow, in the first place.
They have set an example, that all of us can follow and make our country equally clean.