I went to Japan, Hong Kong and Taiwan, I notice their buildings, parks and underground stations are clean and quite well maintained.

But compared to Malaysia, I just don't understand why our buildings are so run down after just a few years.

Eg 1: Zoo Negara's panda enclosure, when first open it was clean and nice, after just a few years, the roof is dirty and blackened
Eg 2: I visited Aquaria 10 years ago vs recently, it looked quite run down.
Eg 3: KLIA, when first opened, it was fantastic, modern and clean. But toilets are dirty, until recently they nbothered to do something about it, but you could see it being a bit run down. Trains kept breaking down.

Is it because of the humid weather? or is it just because the authorities hold back budget for maintenance or cleaning bill ?

I give another example, bus stops, roof leak, MRT station looks dirty.

Why we can't have 1st class maintenance?

Even Bangkok is cleaner than here.