I agree that mold is everywhere. It always has been. People make a big deal
out of everything that is potentially dangerous. wash off what you can with
the bleach solution. (a garden sprayer will work awesome) Seal up the areas
with Kilz. (removing the oxygen kills it). put a dehumidifier in the
basement.
Take everything you see in here with a grain of salt. be leary of what a
professional mold removal company has to say, they want your money.

just my 2 cents

Rob