The Falcons and the Globals have FAs, the Challenger may have ISRs "only". But essentially they do the same job, except for the safety briefing that has to be done by the flight crew.
Cleaning the cabin is - in 90% of cases - quickly done. There are only a few flights where the cabin may look like after someone has detonated a bloody food-bomb. And GloballyChallenged writes: I don't mind doing this for a salary like this. It's part of the job. If someone does not feel comfortable with this kind of work, stay away from business aviation!