@Jdub: "It seems like you think that cleaners are not the type that could have actually attended university"
I like your posts, but on this one you seem to have thin skin. I know of only one couple who run a very successful cleaning company. Both have university degrees. Everyone else that I have met in the cleaning business has education ranging from literally nothing to high school. That could be several dozens people. In my post I referred to people who do the physical work, not the ones hiring and firing.
When I say "if I go by..." my only intention is to be objective, I have no personal experience in the cleaning business, so I am forced to rely on other people's anecdotal accounts regarding pay, which can vary widely from person to person.
Nothing wrong with making a living in the cleaning business, but generally speaking, the people in the trenches don't make a lot of money. They make decent money only. Also, generally speaking, the average education of those people in the trenches is below 12th grade. I wish I could say otherwise, but that doesn't square with the facts.