I have 5 corny kegs and have used them gleefully for a while. Just recently I noticed that two of the empties have a ring of white residue around the inside, about half way up. It looks almonst like an abrasive ring. You can scrub it with a brush but it doesn't really come off. I'm thinking it might be residue from the liquid line cleaner I put in the keg to clean the lines. Maybe I didn't clean out the keg very well afterward.
Anyone know of a way to soak it off?
Thanks in advance, guys.