I recently bought a car with some hail damage, and someone told me that you can fix the exterior dents by throwing ice on (for instance) the dented hood. I'm a bit skeptical of fixing dents caused by ice by applying more ice, but I wonder if it could work. Currently, I live in Phoenix where it isn't uncommon to see outside temperatures above $110^\circ$F ($43 ^\circ$C). If you did throw ice on the hood, would the thermal contraction be enough to fix (or at least reduce) the hail damage? Would there be any other side effects?