Before: Comparison photos document attached dust on flexible duct lining and deposits in the return passage. Process: We connected vacuum collection under negative suction and used a micro agitation whip at a protected supply opening to loosen attached buildup. Blue tape and covers protected the home and concentrated suction at the working openings. After: Photos show exposed flex-duct ribs and return surfaces after source removal. Existing coloration and adhered surface marks remain distinct from removed dust.