Before: We documented deposits on the blower components, supply boot, and return passage. Pale deposits were recorded as suspect growth during inspection. Process: We accessed the air handler and return passage for cleaning, connected vacuum collection under negative suction, and used an agitation whip at the supply opening to loosen attached buildup. After: The selected photos show exposed air-handler surfaces and the return passage after source removal, plus sealed connections documented at the supply opening and air handler. Existing dark staining and adhered surface marks remain distinct from removed dust.