[mikeesik]

I keep a can of spray paint-black- in my car.
If one has earned a black mark, they will have their plate covered.

I am working on using cat crap and urine from the good old box and mix it together and store it outside of the car.
If anyone is not too polite, they will know it when they turn on the vent or A.C.
Fun Factor involved.
It almost makes you want them too.!