How do you know if mold is behind drywall?

https://www.moldtestingrockvillemaryland.com/
Most mold is unmistakable, but sometimes small or largely hidden growths just make a surface look dirty.
A quick test for mold can be done when you dip a swab in diluted bleach (1 part bleach, 16 parts water)
and dab it on the wall. If the spot quickly lightens (or keeps coming back after cleaning), assume it’s mold.

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