The layout of the house is odd. When visiting my family we stay in a sort of self contained lower ground floor flat. Outside the flat, inside the house, there is a "hallway", with a staircase up to the rest of the house, and a small toilet, door to laundry room, door to freezer room, and two storage rooms. My dad is disabled and never comes to the lower ground floor, he cant access it.
In addition to the times I come here with dh and kids, I have come on my own due to my studies, so I am here pretty much every six weeks.
Every time I lean, I clean the flat, this includes cleaning the loo, and hang up a fresh towel. Every time I return, the toilet looks a mess. The towel has not been touched.
I can only assume that some persons unknown are using the toilet, and they are not washing their hands.
I'd like to know whats going on. It could be some of the nurses visiting my dad popping down to the basement to nip to the loo 
which I find hard to believe, they wont even accept a cuppa.
Not that I think I will ever find out. I am just sharing.