Over in my country, we have what is called - PRO WASH. its the best coin op car wash constructors and chemicals supplier
They are nationwide and use the best industrial products they can get
It's cheap, the soap doesn't strip wax or sealant and slickness is not that effected
A nice 32 degree shampoo with the 1000psi high pressure gun takes off all the gunk and they have RO water rinse cycle which doesn't leave waterspots
Their vacuum and detail bays are undercover and away from the water spray of the bays
By just taking your car in there, using the soap first (don't do a water rinse) and finishing with the rinse means no hand wash marring, no dirty water and your done in five minutes max. No hoses to drag out, buckets to fill, wash mitts to wash etc
I know it goes against the autopian and autogeek way of doing things but no matter what I did, I got swirls on my dark blue paint when hand washing. Now I get nothing. Sure my car don't get caked with grime like in the USA winters but it's quick and easy
Oh and I slide the soap and water along the paint, I dont spray it at the paint