Cleaning car without rinsing?

Dwight Frye

My car is the platinum graphite color. It is well protected with multiple coats of Zaino. It is covered during the day and garaged at night. I use a California duster to remove light dust and touch it up between full hand washes with a quick detailer spray and the "blonde" plush towels that I purchased from Zaino which are super soft and plush. I turn them often, use plenty of detailer and don't rub hard. They get tossed in the washing machine by themselves with a little liquid detergent afterwards and use about a half tub of water as 2 towels will do the whole car. No discernible scratches in the paint and I receive compliments almost daily about how my car still looks new after 2 years.
But I live in Sou. Cal where it can be weeks or months between rain and what the heck is snow ?