RE: (Your thread-starter title)...
"any human beings know the difference between cg glass cleaners"
Perhaps (someday) the anthropologists will study this particular-difference scenario of human-beings:
"knowing".
After all...
It was the anthropologists that discovered the cave paintings that depicted that some of the
'earliest Human-beings' having traits such as:
Creativity, Consciousness/Awareness, Personalities, and even Abstract Thinking...that other Human-beings of that time (40-50,000 years ago)...
did not, or could not, comprehend ("know") what the
"Artistes" of their day were expressing.
Is it possible, then, that in our present day and time here on Earth (the 2010's)...
That there are modern-day Human-beings that can't comprehend ("know of") the same anthropologically-discovered:
Creativity, consciousness/awareness, personalities, and even the abstract-thinking...of the Human-beings
that are associated with the:
"Caves of the Chemical Guys"?
In the above example:
Whom, in your opinion, would be considered the: Advanced amongst the specie?
Bob