For a complete interior and exterior detail $75-$100 is reasonable. Dealerships usually charge around $80 (I used to detail cars at a Chevy dealership), and detail shops will charge at least $100 or more for a full detail. By "full detail" I mean engine and wheel/tire degrease, wash, maybe clay if needed, scratch removal, glass cleaning, and wax. Interior vacuum, shampoo, floor mats, wipe down/clean dash and all plastic surfaces and seats. Then dress the engine, tires and interior. I do this at my house and it takes about 5 hours depending on vehicle condition when I start. If you do a good job you should have no problem getting $100 per job. Especially since you would be using your own supplies. Detailing cars/trucks is a really good way to make cash on the side.