mold growth on carpet backing 3

https://wiki-wire.win/index.php/Effective_Porous_Materials_Mold_Removal:_What_Works_and_What_Doesn%27t

Damp carpet backing can quickly turn into a breeding ground for mold, especially in basements or after water damage. You might notice a musty smell first, followed by small black or green spots creeping up from underneath. It's not just unsightly—it can degrade the carpet's structure and even affect indoor air quality. Once it takes hold, removing it involves more than just scrubbing the surface; the backing often needs to be replaced entirely.