Cleaning pays well. I know ladies that make more than $100 a day to clean houses, and the real ambitious ones make more. I knew one that made enough as a single parent to send her two sons to private schools and then to college. You can also start a janitorial business to clean houses after construction or to clean commercial buildings. Industrial cleaning or janitorial pays well too- if done as a business, self employed contract work. Cleaning jobs as hourly or salary work doesn’t pay much but as a business it can do well.
A hundred dollars a day is good pay? Um, I don't think so. Figure it out: that's $500 a week, or $25000 a year if you take a couple of weeks off for vacation. I'd love to know how your friend the cleaning lady could come up with private school tuition on $25K a year, because most private schools charge more for tuition than her entire annual income.