We normally believe a lot in what we can see, so when you look at public convenience, even if it seems totally clean and sparkling, you will always consider it dirty and a place to quickly go, do your thing, and leave. But other places seem clean, look clean, and so we consider those places as clean. Obviously, we cannot look at the places at a much deeper level, and truly determine whether these places are also clean, or do they also contain a lot of germs that can cause public illness. Would you be surprised if you knew that there are many places as clean as a public toilet, even the seemingly clean ATM (link to article):
The next time you take out money from an automated teller machine (ATM), make sure you either wear gloves or wash your hands. Cleanliness tests have revealed that cash machines are as dirty and carry the same germs as public toilets.
Health experts took swabs from the numeric key pads on a string of ATMs around Britain that are used by thousands of shoppers every day. They then took similar swabs from the seats of nearby public toilets and compared the bacteria under microscopes in a lab. The swabs were left to grow overnight and samples from both locations were found to contain pseudomonads and bacillus - bacteria known to cause sickness and diarrhoea, according to the Daily Mail.