Yeah, I do this all the time on account of like you said Martin, the aggregate gets in the way on the dump out, just another thing to fool with, most are going through the Coinstar, so I dont care if they come out shiny fresh or not..........I just dump in all coins without doing a sort...add a little water, a shot of liquid handsoap, and let them tumble for a few hours tops..sometimes only 1/2hr or whatever......
It is intended to knock the 'stink' off so they go through the 'Star with no issues...Of course I pull the somewhat shiny ones and spend them over the counter,
A lot of times in field on the way home past a 'Star with a load of dirty clad, I put them in a styrofoam coffee cup, add a bit of water, and shake for a few minutes like I'm making a martini, then I dump them out and rinse the dirt and grass off right there on the hood of my car in the parking lot, lightly tamp off the moisture with a rag, and proceed inside to the redemption masheen!...
This way, they dont stack up and get out of hand!