I get a build up of crud on my chiller after a while. Just dark brown stuff and mostly near the wort line. It seems like it's cooked on break and hop material so I just soaked it for a few days in starsan and scrubbed off as much stuff as I could. It's not uniformly shiny now but now I'm wondering if I need to do something to repassivate the copper prior to using.
or is this nothing to worry about and and I should just rinse and use it at this point?