Looking for reputable CLEANERS for HVAC / Forced Air Ducts (post construction)

We just finished a cellar job that left our air ducts completely dusty — so dusty we have not turned on the A/C despite the recent hot weather. Even without the system running, the ducts are spewing a fine dust. Does anyone have a recommendation for a reputable cleaner? I saw that someone recommended Sears in an old Brownstoner thread. Anyone else I could call for a price comparison? Any help is much appreciated.