I did drive it through a creek back in December. Does that count as a wash session? No soap, sponges, towels or brushes were involved.
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Lack of equip & supplies & payment doesn't automatically make it a dry wash.
Definitely drive-thru wet wash session ... sponsored by Nature.
If water flow significant, downstream brushes could become involved & you could end up paying for the scrub with your fender quarters.
Preferred drives in rain with my old Ranger. Touchless and gentle clean.
However did get some free dry wash 'sponge' scrubs a time or two.
Full disclosure--no chance to take pics, unfortunately.
Couple times caught in severe desert windstorms (bone dry conditions) driving highway speeds near Las Vegas.
Hundreds of tumbleweed balls suddenly appeared (some tall as my truck) & came flying across the desert & onto the road.
Sped toward head-on collisions with my 04 Ranger Edge, incoming at approx 30-degree angle toward driver side.
Hard to discern what they were at first, or their true sizes (initial flash thought they were desert animals, perhaps fleeing the storm) but as they rapidly drew closer (combined closing rate likely 100 mph or more). began to look like 'Return of the Mummy' type movies with thousands of soldiers (or zombies) rushing across the vast sands.
Thought I'd had it for sure. Forward vision of road totally obscured for a few long seconds.
Totally amazed when they safely careened off my front end like giant sponges.
The largest balls (6-to-8 ft dia.) hit the front & bounced over hood and roof!
--Spif
Luckily driver window & windshield remained intact.
One tough truck it seems.
Definitely had a close brush (or scrape).
As said on TRS, the paint scratches simply added some unique character to my ride!
[To me too. Probably had to change my pants after arrival at destination.

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