Acidic... [ Perhaps it's fortunate that he hasn't spent much time near it himself. ]

If someone has recently been here then it isn't much of an evacuation. [ He plucks up that lighter, flicking it and being presented with a small flame. Still had fluid in it, then. It's snapped shut and tossed back into the drawer as he exits that little parlor, heading through a doorway and into a spacious kitchen. Still the architecture seems strange to him; Konoha was so different. ]

I would expect to smell something rotten if someone left in a hurry.