How does everyone clean their coins they collect from their vacuum bins? I built a large screener that I dump my debris into and then "rake" it across a ¼" screen. Then pick out the coins, jewelry, etc. But most of the coins are pretty dirty and gummed up as well as oxidization and corrosion. How does everyone here clean their coins to turn into the bank. I have about 50 lbs of coins I need to clean and exchange but they're pretty dirty and the bank won't take them this way.