The Cape is clean!

I like to travel.  If I could I would make a living out of travel.
Went to visit the Cape the weekend past - what an exceptional place.  We had four days of brilliant weather and travelling.
For you that knows the Cape Flats; we lived in Simon's Town and from there traveled to Gordon's Bay, Hermanus, Franschoek, Paarl, Melkbos and Blaauwbergstrand, as well as the peninsula - covered about 1000 kms during our stay.
What struck me was how clean the Cape was, very little anything laying around with the roads in working order and maintained.
The only place where I found it dirty was where the N2 crossed the Baden Powell, in the river - looked like Gauteng.
My question is - why is it clean there and not in Gauteng.  Why is clean next to the N3 to Durban but the moment you cross the border to Mpumalanga or Gauteng it becomes a dump?
Is it because of the wind in Cape Town, is it because of the government or is it due to the people living there appreciating their environment and personally making an effort to "be clean" and preserve?
I don't know - however, it was nice visiting the Cape.