I lived in Oregon most of my life and being a "Car Guy" I often washed my car in the rain.
When I was done, my car would be clean, and wet, but at least it would be clean. Remember, in areas where it rains a lot you can't avoid having a wet car, especially if your car is not parked inside a garage.
At the same time, in areas where it rains a lot you get Road Film on your car's paint and on everything else, glass, chrome, plastic etc. In fact I mention this on a segment with Dennis Gage as a way of educating the audience, why they need to polish their car's glass.
Back to road film... road film builds up on the exterior of your car and doesn't go away until you wash it off, it's usually an oily film as it's a mixture of all the fluids cars drop as they are driven down the road mixed with the rain water sprayed onto your car by the cars in front of you.
It's usually a dirt or brown color as it build up over a few week in a very rainy area like I lived in back in Oregon.
So if I wanted a clean car, and I mean if I wanted to remove the road film building up on my car so that even if my car was wet it was still visually clean, then I had to wash my car in the rain. Waiting for a sunny day could take a while.
I often washed my Milk Truck in the rain because it didn't fit in the garage and I used it for business and it's important when you detail cars or sell detailing supplies to drive around in a clean, shiny car, or in my case, a clean shiny Milk Truck.
1966 Milk Truck
Washed it in the rain, right in the middle of this driveway for 3 year before moving to California with it. Parked the Caddy in the garage, (barely fit), and the T-bird is my best friend Brian's and he still owns it today. (I buffed out both the Caddy and the T-bird of course).
I never did like the guy in the FB page did and pour dish washing soap over any of my cars but instead used a dedicated car washing soap.
