Last weekend I brewed a Huge Russian Imperial Stout. Needless to say, everything is Black. My main concern is my immersion Chiller. I have always just rinsed it after a use. Granted it has always had some Hop remnants on it, but nothing to sweat about. Well, my Chiller is Filthy now. I remember someone here saying something about a 5 gallon bucket and a certain solution dunking. Can anyone refresh my memory so I can get my Chiller back to Standards?