Brandon, let me throw a couple of things out for you to think about. Around my airport there is more need of this service on the corporate planes. Most of the smaller planes the owners themselves do this. On the corporate planes there is a huge potential liability. On our plane I hang around pretty close while it is being cleaned up even though I know the person doing it and he happens to be an A&P. A broken static wick can be $200-$300. Wax in the static port, not good! A broken temperature probe for an air data computer, you don't want to know. Don't even ask about a windshield with a scratch in the UV coating. On the inside, I don't let anyone clean up forward of the front cabin divider.
Unless you have liability insurance or a good enough relationship with the owner to get a waiver of liability you might want to think this through a little. JMO.