Warning: Do not touch dry ice to bare skin it will hurt you, make sure that you use heavy gloves when handling this substance.
I have not personally verified that this trick works, but it looks like it might be worth a try.
Basically what is happening is the dry ice condenses metal and shrinks small dents on your car. To properly perform this trick you need to place the dry ice on the inside of the dent if possible.
Other uses for dry ice include:
- Mosquitoes Repellent (sort of): Mosquitoes are attracted CO2 from humans and animals. Try placing pieces of dry ice in areas away from where people congregate.
- Gopher Destroyer: Since dry ice is heavier than air, it will sink to the bottom of a gopher hole. Place 1 to 2 inch pieces of ice as deep as you can into each hole, then fill the top of the hole with dirt. Make sure you do this to all holes, otherwise the process may have to be repeated.