FREIGHTMAN,
who do you fly for ??
For our paperwork in the front of our techlog has a copy of the daily / intermediate inspection in it.
You will find that it has an entry on there for what you task there for it is an engineers task to do instruments, but not clear out your coffee cups, that is down to your own lack of respect to your fellow pilots.
oh yes 'Eff Oh' , the cleaners were probably trying to get the stickey coffee away from the last spillage caused by Air crew.