Some cultures are much cleaner than others ... that is the truth.
india is not one culture though - where christians or muslims live like goa, kashmir it is relativelu clean. Also villages where low caste live it is also ok. The shitshow begans where brahmins and others live like "holy city" varanasi/ temples/ indian cities.
Also i have seen some seoul videos in 30s 40s - it aint that clean.