

What is this?
The tenants claim the dark stains on this ceiling are from cooking....they say they are grease stains. 🤔 My thought was it looks more like mold bc its also in the living room but why would it have stripes? Are the stripes the ceiling joists and the whole roof was leaking maybe??
Also how would you fix this? It's the old popcorn ceiling....paint with kilz ? Thanks !