I have come across very few, but still a few who do have a home, job, business, who are still smelly after a shower and their clothes reek.
Also punters who are clean most places, but do not realise they have smegma under their foreskin (sometimes due to inability as a result of physical size(large body, small penis they can't really see).
I am tactfully honest so the person has a chance to understand, I then attempt to remedy either at request (ie need you to have had a bath or shower same day at least), or actually popping them in the shower or cleaning them myself. If that does not work then I have to say goodbye, no more bookings. One person this happened with was difficult in other ways including actually making a booking, and is the only person to have given me the shivers looking at him. I told him on next enquiry I cannot accept any more bookings. He did persist with questions, I asked him to simply stop.