There is a hand wash place 3 minutes from my house. The guy runs a monsterous business, raking in a ton of cash. He gest $9.95 for a full service hand wash and extra for that crappy wheel cleaner, clear coat protectant, wax, etc... (all nonsense)
However, the wash is awful. 10 guys attack your vehicle with wash mitts, swirling the living daylights out of it and missing spots. Then, they take those filthy mitts and attack the next vehicle along the assembly line.
To open a fixed location with ALL the necessary equipment, supplies, dependable, dedicated labor, start-up costs, etc... will EASILY run you in the $100's of thousands. I know another place near me which went for $750,000.
It's one thing to take an old gas station bay or two (that has been properly inspected & cleared) and do quality hand washes with some hired help. With the right look, marketing and quality results, people won't mind waiting to have their cars done if you have nice place for them to chill out. Also, you can still offer detailing services. I would love for their to be a place like that so I can take my car in the 15 degree weather I have been experiencing for the last month.