Ok I am willing to try anything,,if you guys recommend oxy on everything every time then I'll do it. Also I know it's not my problem because the off flavor is before packaging ,but how do you oxy your bottles? Seems labor intensive. I have just been rinsing bottles as soon as they are emptied then hitting with star san .
I clean all post-boil equipment except bottles with Oxi. The bottles, I just flush REALLY well with hot tap water right after emptying, including swirling the hot water around in the bottom to pick up any sediment. Star San just before bottling. At one time, I started seeing a ring in the necks at the liquid level. I started running my freshly washed little finger in the neck to scrub out any possible remnants of a ring. Then inspect by holding up to a light. Been doing this for about four years with no problems. From reading this forum it seems that lots of brewers clean their bottles this way.