DON'T SWITCH @Maggie72! I clean with vinegar & water as well (and my floor and counters have NEVER been cleaner!) I turn on the ceiling fan to dry the floor & counters more quickly but it is FAR safer and pleasant (no film left - like bleach, etc) than a commercial cleaner - which people (trust me) will complain about as well. Just try Pine-Sol for instance! 😂
I know you talk about his stay in the past tense. Did they mention it while they were there? Did they go to AirBnB to ask for 50 or did they ask you? If they go through AirBnB I am sure AirBnB will tell them all places must be cleaned.
The smell is far better and safer than germs...just mention that!