Quite literally not going to be the case. Your business just won't scale as your costs will increase with the number of services you do in a day - making it unscalable and less profitable. You'll then try to follow the marketplace model, realizing that upfront costs are much higher (payback is easily in years), churn is going to be high, people returning from work and stopping at local car washes would churn faster, etc.
Specifically:
1. Quality isn't even a difference maker here. Quality saturates real fast in this line of work.
2. Pricing only hurts your return as you scale.
3. Marketing - you can only grow through WOM and WOM is NOT marketing. Most carwashes acquire for cheap as they have GMB discovery, which you as a mobile service won't be able to compete (proximity + visibility that's extremely organic). So, you go and say you'll "run ads" - well, your CAC is going to easily break the 3:1 ratio of profitability as you can't outcompete near zero CAC acquisition from GMB listings. All bad assumptions here.
4. Following local regulations has nothing to do with success -
that's your bare minimum that you need to do to exist as a business.