Remove it properly, and remove the cause
Mould (or mold) grows wherever materials stay damp: after a leak, a flood, or years of condensation in a basement, attic or bathroom. Cleaning the surface doesn't fix it if the wall behind is still wet or the source is still there.
We start by finding the moisture. Then our IICRC-certified technicians contain the work area with plastic sheeting and negative air pressure so spores don't spread through the house, remove materials that can't be cleaned, clean and treat what stays, and dry everything before we close it up.
Where we find it most
In GTA homes: finished basements with a slow foundation leak, attics with poor ventilation or bathroom fans venting into them, bathrooms without enough exhaust, and behind walls after water damage that wasn't fully dried.