have the entire surface of the inside of your car's windows covered up with a removable, light, paper sign.

CAR WINDOW ADS. These are different than leaving pamphlets on the windows of cars. This is where you have the entire surface of the inside of your car's windows covered up with a removable, light, paper sign. This sign could be a blueprint size photocopy with quick release fastener devices on the corners. The main benefit of this system is that when it gets dark out you can turn on your interior light and the entire sign becomes illuminated.