Duct cleaning in my 1.5 storey house resulted in everything on the main floor being covered in a layer of black dust, and my floor covered in debris from the ducts (dust, dog hair, plant leaves etc.). I literally had to wash every surface and wipe down everything that was on it.
Two person duct-cleaning crew was in a mad rush and offered no communication.
I went with HD (Steam Dry Canada Ltd.) to avoid being ensnared by sketchy operators in this industry, but it did not appear to help.
Picture shows rag after I wiped off my dining room table.