That's what I would do Except the vinegar. Next time I'll have to try it. I don't get many coins anymore hunting farms and such.Mine is a 3# tumbler and all I tumble is spender coins. Media is white aquarium gravel, dawn dish soap, some white vinegar, and water.
Make sure you clean your tumbler after you use vinegar and salt it will corrode your tumbler fastIt seems to work a little better for me. The vinegar is a light acid and helps cut the crud a little faster.