Chemical Guys Citrus Wash and Gloss. The more soap you add, the higher the PH level becomes. It’s a great cleaner for road grime with very good lubricity. You can get a gallon of it on Amazon for 20 bucks that will last a very long time. I’ve used a lot of car washes and this has been my favorite. Gold class is a close second if I needed something quick and available at any store.
There are a ton of options. If you have a coating, or need a soap with very good cleaning power, I'd go with Carpro Reset. Hyper-Wash, Optimum Car Soap are two I also like.
I use Chemical Guys Extreme Body Wash and Wax. I buy it by the gallon on Amazon for around $25 and it lasts me a very long time, thats washing once weekly. I HIGHLY recommend it.
For OTC products, Meguiars Gold Class is good and available at WM.
KIDDING. When I do wash by hand once or twice a year, I have a giant bottle of Turtle Wax wash that has carnauba in it. I think I paid $5 for it and it will outlive me.
Can't go wrong with a gallon of Meguairs Gold Class (easy to get anywhere and cheap), or even better a gallon of their D110 Hyper Wash (not as easy to find but well priced.) A little goes lonnnggg way with the Hyper Wash...