If you don't mind me asking... what are you charging for your services? The only reason I ask is because I think there is a fine line in pricing that you need to find (if you want to step up to higher end, more advanced work) that will discourage the average "Joe Car Owner" from asking you to wash his car for him and attract more car enthusiasts to your services. I fully believe in the logic that if your prices are too low, people may have a hard time trusting you with their car, which is why you may be picking up some lower end/grunt type work.
Also, it is all about who you are marketing to. If you market to the general population of car owners, typically most of the responses you get are from people who are either unable or not interested in taking care of the car themselves, so they just want it to look "clean".
I, for instance, only market to local car clubs and car forums because these are people that are truly passionate about their vehicles and see them not only as a means to get from one place to another, but as a hobby and a true piece of art (for the most part). These people are the ones that are more likely to take your advice to heart when you show them the proper washing techniques and point out paint defects to them such as swirls and scratches. They are more likely to want these defects removed from their beloved car and are typically more willing to pay for your services! The vast majority of the work I do is paint correction because that is what I display on my site and that is what I talk to people about. If you can show them what is wrong with their car and then show them how it can look when you are done, you'll have no problem picking up some more in-depth work.
Good luck!
