There are good cleaning ladies and there are bad cleaning ladies. Bad cleaning ladies? You want to avoid. Good cleaning ladies? They sometimes do bad things by being too good. Like the cleaning lady who cleaned a "dirty" art piece on accident.
There are 18,000 parking lot attendants in the U.S. with college degrees. There are 5,000 janitors in the U.S. with PhDs. In all, some 17 million college-educated Americans have jobs that don't require their level of education. Why?