I just got a couple new-to-me corny kegs and in the process of cleaning and rebuilding them with new o-rings. One came out looking like new, but the other has a last little bit of something that I can't seem to break loose with hot oxy clean, scrubbing and even tried 12% hydrogen peroxide and baking soda. Been at this for a couple of days and wanted to see if there were any suggestions for next steps. Before all the efforts, I soaked in oxy clean for 2 weeks.
Thanks in advance. Here are pics of what is left.
Thanks in advance. Here are pics of what is left.