Molds are always present in the air and typically grow and flourish in damp, warm, poorly lighted areas, or where air circulation is poor. This is why using the proper professional grade steam cleaning equipment is extremely important when cleaning your carpet or upholstery. Rental machines, home units, & steam cleaning services that buy small truck mount equipment just big enough to get by can very damaging to carpet and cause mold growth.
Improper Carpet Cleaning Will Cause Mold Growth
What's In Your Carpet?