These streaks of gross substance have stayed outside my bedroom for weeks. No way to clean until the window cleaners run the outside of building once every three months. I always chalked it up to people depositing trash out the windows of this part hotel and the trash falling out the bag and food running down (it's a thing in skyscrapers, easier for shitty people to drop trash out a window then walk out in the hall for the rubbish chute) , but today, on my last day here, I realised the spread pattern is probably a drunk hotel guest a floor above who vomited out the window.