To properly vacuum your car, start by going through and removing any large garbage pieces of debris, remove the floor mats, and use compressed air to blow out the seat tracks and in the seams to loosen the debris. Sand down any burrs on the attachment mouth to prevent it from snagging the carpet, push the seat back, lay the seat back, and start vacuuming in a counterclockwise direction. Brush the carpet fibers to loosen the dirt before vacuuming it, and vacuum the floor mats before you return them to the car.