This was playing in my noggin while washing my work truck in a tropical storm.
Neighbors driving past giving me looks like I'd lost my mind. But in a rain storm there's no worry about soap drying before you rinse, did you rinse all of the soap off, did you miss a spot etc. Nope mother nature did a pre-soak, you just wipe and wipe and the rain rinses it off the whole time. I didn't even need to use soap.
When I was done and went indoors a deluge with gusty winds took place for about 10 minutes, so now my truck looks like new in about 20 minutes versus an hour, and no stuff to put away except a wash cloth and car was brush.