I've actually had a tough time selling this as a service sometimes, because people think they can do it themselves, or have some yahoo buff them out in the parking lot at work,. What the heck, I invite them to go ahead and do it, and come back when they get tired of the constant maintenance. When we do sell the job to a customer, it's usually when the light/s are removed for something else, and the selling point is zero maintenance and lifetime warranty against fading.