Before: Photos document deposits on air-handler components and return-passage surfaces, including pale deposits recorded as suspect growth during inspection. Process: We opened the air handler for accessible component cleaning, connected vacuum collection under negative suction, and used micro agitation whips at supply openings and a larger whip at the return opening. After: Comparison photos show exposed return-passage and air-handler lining surfaces after source removal. We documented sealed supply access as well. Existing staining and material discoloration remain separate from removed loose buildup.