Around here, the JWs are also heavily represented in Pest Control work.
(A few - but not many - are like me: i.e. a busted a%s electrician).
Incredible as it now seems, there was a time when cleaning work did pay very good money.
I even know a non-JW who threw in his Engineering Diploma course to take up full-time cleaning contracts. Initially, he was working part time as a cleaner, to supplement his income while attending a Technical Institute. He ended up figuring he could make more money from cleaning contracts than what they were ever going to pay him as a diploma-qualified engineer.
(For the record, this same person now makes some sort of a living as a Gold Buyer - his cleaning contracts could not have worked out too well in the long term!)
Bill.
PS: Somebody has to do it, and I don't look down in contempt on any honest occupation. What is sad is the way all too many young JWs are presented with little choice as to what they will do for a living.
Myself, I have been a farmhand, truck driver, tractor driver, factory hand, cleaner, car park attendant, crane operator, bulldozer driver, timber worker, trades assistant - before waking up to myself (and the WTS bull#hi*) and managing to get into an adult apprenticeship. (The first apprenticeship prematurely ended when the elders told me to do so, during the pre-1975 hype!)