So I think I have an answer to this one. I have (had) a small spray bottle that I thought was full of star san that I had been using for spot sanitizing. Its the only small spray bottle in the house. So yesterday I saw my wife cleaning with it and asked “what are you doing with my star san bottle?” Turns out she had no idea what star san is, thought the bottle had water in it. She dumped out my star san and filled it with - bleach water for cleaning. So I guess I’ve been spot sanitizing here and there with bleach water and not rinsing. I’m guessing that would do it and it probably wouldn’t take much for a 3 gallon batch. Still wondering why that wouldn’t have been apparent at bottling though. Now I’m going to go buy a new spray bottle and write star san on it in big letters with a sharpie.
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