What this video covers
Professional remediation looks like a lot of plastic sheeting, and the clip explains why that sheeting is most of the value.
Containment plus negative air pressure keeps spores inside the work area instead of redistributing them through the rest of the house when the colony is disturbed. HEPA vacuuming of every surface follows, because removal without capture just relocates the problem.
The takeaway
The visible part of the job is removing the mold. The part you are actually paying for is making sure it does not end up somewhere else in the building on the way out.
Read the full written guide: The Mold Remediation Process.