this noise was emitted from a dirty white truck with the words "window cleaning" airbrushed on the passenger side door and two weathered, stuffed bunnies tied to the front grill. the truck had a firefigther's box attached to allow the cleaning of windows not at ground level. on the side of the truck there was a lever box with 6 levers. everytime the person cleaning the windows would move the box to clean a different one, the sound of the generator would shift slightly and the gear lever would jerk.