heat the dent up hot water Cool the dent. Once the area has been sufficiently heated from the sun,or hot water, you can use the dry ice to remove the dent. Using proper handling techniques, place a small piece of dry ice over the dent. The rapid temperature change will make the metal ‘pop' out. Move the ice over other dented areas to remove all of the dents. Using dry ice to remove a dent from your car shouldn't affect your paint job. If the dent is small enough and you've got some dry ice talent, you can probably make it look like there was never even a dent there. this proses mite take some time .