I havent's run any cleaner through it, just lots of boiling water. Wolud you recomend acidc or caustic? Is there any risk of unpassivate the stainless steel? I'll try runing ir backwards and see if somethings cames out Thanks for the answers!

Hi to everyone! I'm courrently having an odd situation to which i'm not being able to find an answer. We have recently change our chilling method from a cooper counterflow chiller to a plate chiller (Duda diesel, 20 large plates). The thing is that since we stated using it our beers started to...