Sorry to say, but any car will look good or properly detailed without wheel cleaning... really sorry.
Interior detailing may be another history, like a 'separated package', additional costs, etc, but you can include the basics since it takes virtually no time.
My detailing partner starts everything by the wheels, and when she (actually a woman) finishes the first wheel, I ALWAYS(!) say, 'We can give back the car to owner now, it already looks 100% better!'.
That's an 'internal joke' we have here, but trust me, just cleaning the wheels will make enormous difference in the whole that is the first thing I notice.
Please, do yourself a favor and clean those wheels!
For the following, I'm not recommending you to do 'bad work' on wheels, but if you believe this will take you much time for peanuts, rinse them well, use a brush to clean the face of the wheels, and (reserve a MF only for that), wipe them with some sort of 'spray wax' while drying to finish out fine.
I also recommend you to do 'simple interior' for overall customer satisfaction. For that, you may wipe door interiors (painted parts) while drying the car. You may use same 'technique' I've told above for wheels, get a clean MF, use some sort of detailing spray or wax and wipe them clean. Makes a huge difference.
Vacuum interior in a general manner would not take longer than 10 minutes, another 8 to 80 difference.
Using more clean MF towel, wipe interior dust off panels. Be careful at instrument panel acrylic since you may swirl it if using dirty towel.
Charge from $0 to $100 for full work, but do it in a manner your customer will be glad to recommend you to anyone. You are in position now not for the money, but for the fame. $5 more or less nowadays will not make you any richer, or poorer.
Let he know he's neighbor is a Detailer, nothing less.
Keep in mind that people spend (generally, not us! lol) more time inside the car than outside appreciating the shine. I've notice from my customers that although they come asking for paint correction, paint protection, they are always blown by interior proper detailed.
So while you create the 'exterior illusion' of partial cleansing, when customer enter vehicle it continues that boring...
Please, don't get me wrong, I'm trying to help you build a reputation. In little time you'll be able to charge properly for what you do, because everyone will notice your attention to details.
Opposite may be true...
Please, ask if you need more quick tips,
Another thing I may add is for you to do some 'glass work'. D300 compound from Meguiar's MF system works great to polish windshield clean.
If you won't do the interior suggested, try the glass at least, together with the wheels it will make your work look worth twice or three times more than charged.
I see your customer complaining after some days that $75 were not well spent... if you cover critical areas cited, he'll feel proud that he paid $75 for a $200 work. Trust me.
Please, I beg not taking my write up literally, or the right or best way to do things. I'm just adding suggestions that you may add to your knowledge and help you out deciding what will work best for YOU.
It'll be harder than you're thinking, but who said that would be easy?
Wish you good luck, and don't forget to plant the good seeds today, to get the good fruits after.
Kind Regards.