"why cleaners?"
What I think you are referring to is the number of JWs who have janitorial services, wash windows, clean houses, etc. For the United States, the janitorial work may have started in California in the late 50's. It was honest work, could be done during hours that didn't interfere with meetings, field service, etc. If the work was done efficiently the pay was actually more per hour than many traditional jobs. The appearance and speaking skills of many young, male pioneers made them trusted contractors for doctor or lawyer offices needing reliable, honest services.
"2/3 leave?"
Not certain if that's accurate, but you are correct that many disfellowshipped JWs still believe and desperately desire reinstatement.
"romantic interest in JWs?"
this has been proven time and again to be a frustrating dead end. The object of your affection will want nothing less than your conversion to the cult.