I go big or go home and buy the gallon of car shampoo! Most of my customers cars are not in perfect condition, so I don’t need to use tons of foam, 2-3 oz is usually enough to be plenty safe, while also having enough foam on the car so it won’t drip off. I would definitely check your area, but I currently charge $25-30 depending on how dirty it is and what size. A wash includes a safe wash, wheels, tires, wheel wells, tires dressed, and if they have nice exhaust tips I clean those too. On all my details I clean both sides of the glass, no point of having an interior detail and having the inside glass clean, when the outside glass is dirty.
Not sure what you mean by mini detail, but if I am doing a wash n seal or wash n wax I will wash all the outside, do all the glass, ALWAYS do the door jams, and then seal or wax the paint, dress tires. It’s all in the details.
A little tip if you have to do rinseless or waterless then use a 2 or 3 gallon sprayer filled with water so you can clean the wheels and tires. Using APC instead of wheel cleaner and tire and rubber cleaner save a lot of money because most cars don’t need those strong chemicals.