The Professional Detailer I know charges the following for interior cleaning, wash, wax
Small cars - $100
Medium/CUVs - $125
Large/light truck/van/SUV -$150
Wash, clay bar, paint correction, Ceramic coat body and wheels, Same sizes....
$550+
$700+
$850+
He is too notch and has cleaned cars for nascar drivers and moderate celebrities. Regularly coats Exotic cars and boats as well. I use him on occasion to get something done perfectly.
Your pricing power will be related to your market/clientele and ultimately your skill and attention to detail.