Containment
The work area is sealed with sheeting and kept under negative pressure so dust and spores do not travel into the rest of the building while material is being cut out.
Sealing the work area, filtering the air, taking out what cannot be saved and drying what stays. A proper cleanup runs in that order, with the moisture source dealt with first so the same wall does not come back next summer.
Porous material is the deciding factor. Tile, glass and sealed surfaces can be cleaned. Once growth is into drywall paper, insulation, carpet pad or particleboard, cleaning the face of it does not reach what is behind.

Every quote is built from the inspection findings, so the list below is the full menu rather than a fixed package.
The work area is sealed with sheeting and kept under negative pressure so dust and spores do not travel into the rest of the building while material is being cut out.
Air scrubbers run inside containment for the duration of the work, and the exhaust is directed so the air leaving the area is not pushed back into occupied rooms.
Affected drywall, insulation, trim and flooring are cut back to dry material, bagged inside containment and carried out along a planned route.
Framing and remaining surfaces are cleaned, then dried with equipment that stays in place until moisture readings say the space is genuinely dry.
Nobody can remove every spore from a building, and you should be wary of anyone who says they can. A realistic job removes what is feeding the growth, cleans what is salvageable, dries the space and stops the water. What varies between quotes is how much material comes out and who puts the room back together.
Ask whether the price ends at clean, dry framing or includes drywall, paint, trim and flooring. That single question explains most of the gap between two quotes for the same house.
If you are weighing a quick clean against the full process, read removal versus remediation. Start with a mold inspection if the extent is unknown, see mold after water damage if a leak or flood was involved, and check the service areas for your neighborhood. Business premises are covered under commercial mold remediation. On larger jobs, and any time a landlord or a buyer will want evidence the area was finished, ask about clearance testing before the containment comes down.
How much material has to come out, how hard the area is to reach, whether containment has to be built around occupied rooms and whether the rebuild is included. Ask the independent provider to explain each of those on site and quote the work in writing before starting.
Usually not. Containment is built so the rest of the property stays usable, though the affected rooms are off limits while equipment is running. If the affected area is large or central, the provider should say so before you approve the scope.
No. Bleach does not reach growth that has gone into drywall or wood, and fogging leaves the wet material exactly where it was. Without fixing the moisture, either approach buys a few months. See removal versus remediation.
Ask for it in the scope. Remediation itself finishes at clean, dry framing, and the rebuild is often quoted separately. Ask the provider to make clear which of the two your quote covers before work begins.
Call and describe what is affected so a provider can scope the work.