I had an unusual one recently.
Me too, though I wasn't actually asked to leave the windows.
I cleaned a customers windows in late afternoon, and when I called to collect later in the evening I was asked, 'Could you please knock first in future as my son is a night worker and he'd not long been up when you called and was walking round in his underpants.' I replied that I hadn't seen him, and as I use a reach and wash system, there shouldn't be a problem anyway. And she replied, 'He was downstairs.'
I wouldn't mind but the front garden is modest with a well used public footpath within a few feet of the living room window.
Made me laugh because if I could see him, so could everyone else who walked by.