Has anyone ever cleaned the water side of your plate heat exchanger? If so, how did you do it? I've been using my Plate HX for about 6 years now and it seems to be losing efficiency. I keep the wort side of the HX very clean, but I've never cleaned the water side. I'm told that the water side does get build up and deposits in it, and it's normal to clean them in things like on-demand hot water heaters. I've googled that and there seem to be many chemical products out there that are used. But I'd like to get some feedback from anyone who might have done this already for a homebrew HX.