Howdy
I'm a trapshooter in another life, so most of those hulls never make it to the ground. They go directly from the chamber of my trap gun and into the shell bag, and they never get cleaned. Just load 'em up again as is.
In Cowboy, our shells tend to hit the ground. So I give them a quick lookover. If theyr'e a little dusty or sandy, I just give them a quick wipe with a cloth, then reload them. If they fell into a mud puddle and are full of sand, gravel, frogs, and sticks, I might rinse them out, then dry them before reloading them.
But generally speaking, I do not treat my shotshell hulls like brass. I do not clean them. Neither do most trap and skeet shooters that I know, and we go through a lot of shotgun shells.
Black Powder though, that's a whole different matter. Usually after I've fired a hull a whole bunch of times at the trap field I figure I have gotten my money out of it. At that point, I load it up one more time with BP, then just leave it lying where it fell.