Do not try to remove black mold yourself. That is not a sales line, it is how the biology works. Scrubbing a colony launches spores into the air you breathe, and without sealed containment those spores ride your furnace ducts into every room of the house. You inhale them while you work, your family inhales them after, and the roots stay alive inside the drywall or wood underneath the patch you just wiped. What looks like cleaning is really spreading.
Getting rid of black mold safely means fixing the moisture feeding it, sealing the area under negative air pressure, removing contaminated material in a way that does not contaminate the rest of the home, scrubbing the air with HEPA filtration, and verifying the space is clean afterward. That is a trained crew with equipment, not a spray bottle and a Saturday. Nonstop Restoration does exactly this to IICRC S520 standards across Calgary, and the inspection costs nothing. Before anyone in your house touches that patch, call (403) 620-8489.