My 14yo
DD has her own ensuite and it is just as you all describe

I try not to go in there. The TWO hair straighteners draped all over the sink get me the most... they are usually left on. I don't touch it. I never clean it. Usually of a Saturday morning I say: "You need to clean your bathroom before you ask me to go out anywhere" and that does the trick. She also scrubs her own shower recess and cleans her own toilet. My boys never go in there fortunately. Mental note to self: if we move make sure she continues to have her own bathroom! Oh and if I can't find something it's usually there: my gold tipped tweezers, my masquara... I'm about to go in there and look for my new Clinique lip gloss.... nothing is sacred.