They are also known to eat car wires as well. Many automotive companies are following the environmental trend and striving to use renewable materials in their automotive parts. Many have started using edible materials like soy as coating for automotive wires. Rats are attracted to the edible soy wire insulation and damage to automotive wiring has been steadily on the rise. Damage to an engine's wiring can not only be extremely costly — but it can also be very dangerous. Automobiles that are stored for any period of time should be protected from rats and mice. The engine should also be inspected for damage before use.