A thief can't steal what a thief can't see

Question: After having my vehicle stolen last year I decided to install an immobilizer. Thieves tried to steel it a second time with no luck. However, they did manage to do extensive damage to the inside of my car. Do you know of any security device that might stop damage from auto thieves? Please don't mention audible alarm, as my vehicle is often parked in a remote area.

Fourchalk: There is a fairly new product out called the RobberStopper. This product emits a non-toxic, harmless fog that dispenses in about 30 minutes. The opaque cloud fills a vehicle in three seconds, rendering the steering wheel and contents invisible to the car thief. A remote signal lets the owner know when it has gone off. It is installed under the dashboard and operates off the car's battery.