Moisture Comes First, Always
Without moisture, mold cannot grow, which is why cleaning it up while the leak continues just resets the clock. Typical sources include a dripping trap under the vanity, bad window flashing, a bare-dirt crawlspace, or a bath fan exhausting 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. That separation is what buyers and lenders usually want to see.