Just wanted to share this because I've been seeing a lot of DIY water damage posts lately and this is a mistake that can make things way worse. A customer recently had water damage in their basement with some mold behind drywall. Their handyman removed the moldy drywall (good) but then set up fans to dry the area (disaster). The fans basically turned into mold spore distributors. What was contained behind one wall became airborne contamination throughout the entire basement. Air testing afterward showed elevated spore levels everywhere.
The lesson: when there's mold involved, containment is everything. You need plastic barriers, negative air pressure, and HEPA filtration before you start disturbing anything. Otherwise you're just spreading the problem around. What should have been a simple contained job turned into full basement remediation - carpet removal, additional drywall demo, environmental cleaning of every surface, HEPA vacuuming everything, antimicrobial treatment, air scrubbers running for days.
If you're dealing with water damage and you see any mold, don't just start fans blowing. Get proper containment set up first or call someone who knows how to do it right.