Sorry, but the spray stuff, the covers, all the “hide your plate in reflected light” gimmics don’t work. Mythbusters has tackled this one twice using a bunch of different techniques. The camera alwayz won. Bummer...
what if the camera does not use a flash?
(mythbusters did a WEAK attempt [conclusion predetermined] to discredit all the camera beaters)
My biggest concern is while TDY and driving a rental car. Not sure I could take the aerosol on the plane with me.