The air ducts are made of a flexible material with lots of nooks and crannies. Cleaning them will not be effective, and the equipment could puncture a hole in the flexible duct. If that happens, you will have a major problem trying to locate the leak and getting access to it. I would never allow someone to clean the duct system. But, you should have the dryer vent duct cleaned to prevent a fire. That duct is a sheetmetal duct inside the wall.
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