Chris, lights look amazing!!
I can see your idea working, but my question is; How many people out really care about yellowed lights?
Where I live/work, I see plenty of cars with lights so bad it amazing they can see. The sad part is that many keep the car clean but don't pay attention the the lights.
Maybe making a small poster or something showing the difference between clean and dirty lights can help. Once you get started, word of mouth would be a big help also.