Not nearly on the level of most of the stuff on this thread, but I couldn't figure out where else to put it.
My boyfriend has been living mostly by himself in a huge house for over a decade. There are many rooms he never uses, and some I don't think he's even walked into in at least 5 years. I'm here a lot these days, and my kids are starting to use some of those previously unused rooms. I discussed things with him and we agreed that he wouldn't be offended if I cleaned the house top to bottom, and I wouldn't mind doing the work. So I got started today. Let me tell you about the dust and cobwebs. I haven't said ewwwwwwww, so much since the last post-eviction rental house clean up I did (and that involved the floors being so sticky that it literally pulled my shoes off). It's not that it's filthy. It's not, and the rooms he spends his time in are neat as a pin, but those unused rooms are just super dusty from years of not being used.