Mold isn't the problem. The problem is having or creating the conditions
where mold can grow.

I live in Las Vegas. Until the last decade, mold was unknown here. Houses
were simple framed houses with stucco. Very breathable. Very dry, and
mostly drafty. Energy costs were low enough that being airtight wasn't
required. We even used evaporative cooling which boosts the humidity quite
a bit.

Enter, the era of new construction. Vapor barriers. Better insulation.
Better taping and mudding. Really enclosing things in. I think that was
where it changed, because this isn't NEW mold.

Yesterday, I woke up to a leaky hot water heater. They had installed it
five years ago with no pan. So it died, and water came into my walk in
closet and bedroom. I changed the heater, putting it up on blocks, and in a
pan. We got out the wet/dry vacuums, and went to town. We vacuumed and
vacuumed and vacuumed. Then put several fans. We will run the fans for a
few days, and leave doors open during the day.

Point is, mold is like rust on a car. Not much you can do once it is in
there except cut out the moldy/rusty part and toss.

It is far easier to prevent.

Steve