Non-PRO English Art/Literary Poetry & Literature urban life; drug

The following is from Lawrence Block's Small Town. "He" is a cleaner in New York who does cleaning for clubs and some private clients. "He" is also an ex-addict who now attends Narcotics Anonymous meetings and is able to resist the tempt even though he has lots of exposure to drugs in his cleaning work.

I can't understand the last two sentences. Why the dot-com exec, with the jar of amphetamine drug, would do his own cleaning? Does "do his own cleaning" mean something else? Can you please explain to me how you understand it? Thanks in advance!

The excerpt:
He'd run across drugs in the bars he cleaned, too, because people who were drunk and stoned tended to be careless, and the odd Baggie would turn up on the floor, or in the john, or, more than once, right out there in plain sight on top of the bar. And the apartments he cleaned had their stashes, legal and otherwise--the few ounces of pot in the model's undies drawer, the huge jar of Dexamil on the dot-com exec's bedside table, and with all that speed wouldn't you think the guy would do his own cleaning? Like four or five times a day?