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. If the problem is a plumbing leak or roof flashing, a plumber or roofer may need to come first.
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.