I cashed in my clad in a coin machine today. I think it’s about two years of hunting. I thought about getting a rock tumbler but I just ended up putting it in a 5 gal bucket with dish detergent and vinegar and stirring it around with a big spoon. I also tried using a cement vibrating wand but it wasn’t worth the effort. I picked out the crusty pennies. I found two wheat pennies and a merc dime. The security guard at Vons (where the coin machine was) was blown away with all the coins I came in with. I’m just glad I didn’t jam the machine like last time.