Vinegar can kill some mold species on hard surfaces, which is exactly why it is a dangerous answer. It works just well enough to convince people they handled it. What the wipe-down actually does: leaves the roots alive inside porous material, leaves dead mold behind that still triggers allergic reactions, releases spores into the air while you scrub, and does nothing about the moisture that grew the colony. The patch fades, the problem continues inside the wall where you cannot see it.
Black mold is not a home-remedy job, whatever the surface. Disturbing it without containment exposes you and everyone in the house to airborne spores, and the visible patch is routinely the smallest part of the colony. The safe version is professional: containment, removal, HEPA air scrubbing, moisture source fixed, clearance verified. Nonstop Restoration’s inspection is free, so finding out what is really behind that patch costs a phone call, not your air quality: (403) 620-8489.