I've been wondering the same thing. I have been charging 75-100 depending on the vehicle size. Although i don't do any paint correction because i don't have a porter cable yet. I do the wash, clay, polish, and put 2 coats of Americana and also dress the interior. I don't know if i should charge more like today i did my buddys 09 Tahoe took me about 7 hours and charged him 100.