The answer to 'duct cleaning making noise' is that a noisy duct cleaning system is often caused by debris or damage in the ductwork. This can result in rattling, whistling, or other loud sounds coming from the vents or ducts. Common causes include loose connections, obstructions, or worn components in the ductwork or cleaning equipment.
In many cases, this type of noise can be fixed by a professional HVAC technician. They can inspect the ductwork, clean out any debris, and make repairs to fix the underlying issue. Attempting to clean the ducts yourself may dislodge more debris and make the noise worse, so it's generally best to have a professional handle this type of repair.