I wash my car with whatever carwash soap is on sale, as long as I recognize the brand. I use an old dish towel to wash it and old bath towels to dry it. I wipe down inside the doors and under the hood.
I wax it twice a year with any brand name wax, and wipe it off with old T-shirts. It's been working for around 40 years.
I don't get swirl marks, I don't eat off the hood, and every time I trade in a car they want the name of my detailer.
Is my Jeep as clean in every crevice as a detailer would get it? No.
Is my Jeep a work of art or a tool? It's a tool.
Will anybody other than a fanatic think my car is dirty? No.
In many things, including maintaining the appearance of a vehicle, the best way to screw it up is to obsess over it.