Ways to remove small-to-medium car dents include a rubber plunger and a flat-ended hammer. To properly use the flat-ended hammer, a flat piece of metal and cloth are required.
The rubber plunger should have damp edges and be placed directly over the dent. Pressing down creates suction, and pulling back forces the dent out, recreating a flat surface. This method may take several tries and works best on large areas of metal. This includes automobile doors and fenders.
The second method only works on steel. A flat piece of metal is wrapped in cloth and placed on the dent. Hammering is done carefully and only on the underside of the dent. Hammering elsewhere may cause more damage. The metal must not be overworked as it may stretch.