cleaner

Clear the glass surface of the office table, take away the notepad, the keyboard and the mouse. Push the screen to the rear.
There is the sound of the trolley belonging to the office cleaner outside. He will wipe the table surface and the floor. It is better to have the table clear of objects so that he can wipe over it without any bother, otherwise he needs to laboriously wipe between all the things on the table. He will not lift the coffee cup, he will wipe around it. If there is a pen lying on the table, he will wipe his way around it.
So it is better to remove everything, then he just wipes over the surface.
It is no chore to replace the things later.

He is a tall man, gaunt and thin with grey hair. He is always nervous, he has some illness that has caused this, or else these are experiences from his past that cause the slow answers and retiring manner. He is well read and will give an intelligent and clear answer on all kinds of subjects, but he said that he prefers to have his peace and quiet and to clean.

There is a knock, he has arrived. Put on the mask, leave the office for the corridor.
Many people do not bother with masks.
This is probably selfish.