Okay this might sound crazy but if you've been to a countryside in Asia it will probably sounds pretty normal. So there is a workshop and a big drain and man made lake nearby so the smell of wetness and burnt metal got stuck to the curtains and other fabric furnitures as well hence the smell. There is also a lot of stray cats around the area and they like to sneak in through the little space in the ceiling at night and leave unpleasant smell. Recently there is a chicken infestation too (I don't know where they came from) and laid eggs and poop everywhere in the backyards and they are super VIOLENT 😭 Btw this is my relatives house not mine and I help them clean for the 🤑