From Popular Science 1932 – for when cars basically came in three models…
Using the exhaust gas of the automobile to clean the upholstery is the accomplishment of a recently invented device. An aluminum attachment is fastened to the exhaust pipe and the engine is allowed to idle. As the exhaust gas passes through this device suction is created at the inlet hole. Collected by a nozzle, the dust and dirt are drawn through the hose and expelled into the air at the rear of the car. It is made in three models, for cars of different size.
Modern Mechanix » USE CAR’S EXHAUST TO CLEAN CUSHIONS – [via] Link.
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