One of the newest and very profitable extra services a detailer can offer both retail and dealer customers is invisible film protection. This service involves cutting and applying a thin clear vinyl film on those surfaces of the vehicle that would be exposed to rock chipping. This includes painted front bumpers, the front of hoods, side mirrors, etc. You can also use the invisible film as door edge guard. All that is required are rolls of the film and the knowledge of how to cut it and apply. There are even companies that offer pre-cut kits for specific automobiles, however it is more profitable to purchase rolls of film and cut them yourself. The leading supplier of the clear film has a nationwide distribution network that allows you to not only have a local source of the film, but they will also provide you training on the proper method of cutting and application. From what I have seen, the application is very exacting to prevent bubbling under the film, but once mastered, it is easy to perform.
The profits are huge. You can charge up to $1,000 for some applications. A BMW dealer I am familiar with charges $1,100 for invisible film protection on 300 and 500 Series Models and more on the 700 Series.