I would consult your local lawmakers before trying this one:
The PhotoBlocker Spray reflects photo radar flash. Spray it and make your license plate invisible to cameras. Proven to beat photo radar and red light cameras.
Photo radar cameras often utilize a strong flash to photograph the license plate on your car as it speeds by. “PHOTO BLOCKER’s” special formula works to reflect the flash back to the camera. The result is an overexposed and unreadable picture, often preventing a costly ticket.
before you jump up and down, MANY states have laws that prohibit anything that covers a license plate, so AGAIN I would consult your local lawmakers before trying this.