If you have mold in your carpet, removing it quickly is the priority before it spreads further. Mold spores can cause health problems, particularly for people who are sensitive to mold, and carpet is one of the hardest surfaces to treat because spores are typically between 2 and 10 microns across, small enough to settle deep into carpet fibers and padding where scrubbing cannot reach them. On hard surfaces like metal or concrete, scrubbing with a cleaning solution is usually enough.