Mechanical brushing paired with negative-air vacuum extraction is the standard residential workflow at Brush Duct Vent Cleaning, operating from a 3937 Coronado Avenue base in OB across supply lines, return ducts, register interiors and dryer-vent runs. Older OB bungalow ductwork — often routed through tight crawlspaces and mid-century furnace closets — sets the access constraint for most jobs, work that complements the system tune-ups and air-handler service performed by HVAC crews like Efficient HVAC Solutions. Coastal exposure on the OB peninsula introduces a salt-laden particulate load into return-air systems that gets compounded by sand tracked in from Dog Beach and the Sunset Cliffs trail corridor. Exterior building washdown — soft-wash siding, window-frame and roof-line cleaning of the kind delivered by Freshwater Exteriors — runs as a routine pre-listing or seasonal companion service to interior duct cleaning on coastal homes. The most demanding job class is post-renovation duct cleanout, where drywall dust, sawdust and finish-coat overspray get embedded throughout the supply system and have to be brushed and vacuumed out before the HVAC system runs again.