Can't recall ever washing the oldest of my 3 working pickups which is my 1978. Have to repair some broken fencing today with it on the west acreage which is far up a hill near those trees shown in the background at the tailgate (photo taken yesterday, below). Being a tiny vehicle it's much easier on the snow and mud covered acreage at just 2,700 pounds, versus, my massive over 7,000 pound PW which just makes deep mud ruts and a mess. Might use the winch on the PW to pull that fence taut though. In the past 40 years and over 300,000 miles of driving the 1978, I can't recall actually washing it, ever. Semi-retired it back in 1998. I could hose the road salt and mud off it though once a year to keep it from rusting, but usually the dogs peeing on it cleans it pretty good.
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Anyhow, my PW gets about the same treatment. Maybe a bit more washing than none at all. My high pressure outdoor usage well water is too hard and so it leaves a gray messy film on the body and glass. Too low of pressure to rely on the indoor water softener for clean wash water. Makes it quite tough to wash. Takes a long time to clean off the hard water marks on such a large truck. I usually give up.