How to Spot Mold Hiding Behind Bathroom Tile and Fixtures
https://thedamproom.valiantfield.com/posts/how-to-spot-mold-hiding-behind-bathroom-tile-and-fixtures
Warped grout lines, peeling caulk, and a musty smell near the showerhead are clues. Dark spots behind a loose tile or behind a fixture’s base often mean mold. Use a flashlight to inspect corners and behind any removable paneling.