The moisture buildup in a non-air-conditioned space can lead to a growth of unwanted mold. This is compounded by the presence of plumbing lines within the wall and a clothes dryer vent. This heat and moisture source breed mold with regularity. The floor was cleared, the wall was opened up for inspection, treatment, and removal of some insulation. At this stage, the area will be sprayed with a strong anti-fungal product. And better packing of new insulation to mitigate moisture accumulation through condensation of the metal pipes will help. Surrounding areas should also be treated with a product to inhibit mold growth.