Moisture Comes First, Always
Without moisture, mold cannot grow, which is why cleaning it up while the leak continues just resets the clock. That source might be a slow drain leak under a sink, a failed window flashing, a crawlspace with no vapor barrier, or a bath fan venting into the attic.
The scope should spell out what is causing the moisture and whether that repair is included or needs another trade. When the cause is a plumbing or roofing problem, that trade often has to finish before remediation begins.
Dispatcher tip: Ask whether the clearance test will be done by an assessor who is not connected to the remediation company. Buyers and their agents tend to trust that report far more.