A quick little add-on to your detailing service is a quick scratch removal. People come in all the time with one or two scratches to fix which you can do quickly and save them hundreds of dollars at a body shop.
For example, I fixed this surface scratch with some Meg's 2.0 scratchX with a D/A polisher in about 5 mins. I charged a quick 20 bucks and sent them on their way.
Yes it is the same car, the lighting was different outside.
Before:
http://i284.photobucket.com/albums/l...scratch002.jpg
After:
http://i284.photobucket.com/albums/l...ounding002.jpg