Looks like Tesla owners are digging this: Redwood City Car Wash Does The Job With Just 1 Cup Of Water During California Drought CBS San Francisco
Ditto. I've been using their services for the past 2 years. Highly recommend. More here: Eco friendly waterless car wash products/services
I wash my cars myself and use zero cups of water. I live about a 20 minute drive from that establishment.
How do you avoid scratches and swirls in the paint without using a hose to remove dust, sand and dirt?
Only works on cars that are relatively clean. Heavy dirt or mud will need more water. People have been using detail spray to clean cars like this for years. The spray has surfactants that lift up the light dirt, and leave a freshly polished look. Works best if your car already has a coat of wax on it.