Recycling of rubbish is a natural occurence in Buenos Aires. There is a part of the society that participates very actively in it.
There are rubbish bins everywhere, and Buenos Aireans (porteņos) do a good job of utilizing them. In the day and most parts of the night, Buenos Aires is very very clean. Clean like Singapore. Now thats very very very clean. 
But deep into the night, around 12 midnight onwards, you will see rubbish appearing everywhere, especially near the rubbish bins; greyish, sticky trash that was accumulated from the day and night, all strewn on the ground on the walkways.
I couldn't understand this at first and I thought it must be just one or two bins. But then I found out it was every single bin on the streets where I walked!
Even in this cold cold winter season, along the streets you can see the homeless rummagging through the bins, the collected trash put outside the restaurants, outside other peoples' homes.
Then about 2am in the morning, big rubbish trucks and street cleaners with a big sign 'CILBA' (probably means Cleaning It Late Buenos Aires 
) appears and leaves the wherever it goes spick and span again; for the people that have never been out at late nights, its like nothing ever happened.
6am in the morning, Buenos Aires is once again very very very clean.
