I have a keg filled with 2+ years old of a barelywine that I sample every once in a while. Unfortunately, I've been a bit disappointed because it had a slight funky flavor to it. It wasn't bad but it just didn't taste right. So I would just leave it alone and let it age longer to just sample later. I noticed that always the first poured out sample always tasted funky but the second sample tasted much better.
I decided to just disconnect the tap line and take it apart and clean it. And to my disgusting surprise, it had a nasty gunk of something in the line where the tap was. It was slimy! So after clean and sanitizing the tap, I put it back on the keg and poured a pull snifter glass and the damn barleywine was so freaking delicious!!!! Dark fruit notes all over the place and couldn't detect the 15% ABV at all!
TLDR: Clean and sanitize your picnic taps often!
I decided to just disconnect the tap line and take it apart and clean it. And to my disgusting surprise, it had a nasty gunk of something in the line where the tap was. It was slimy! So after clean and sanitizing the tap, I put it back on the keg and poured a pull snifter glass and the damn barleywine was so freaking delicious!!!! Dark fruit notes all over the place and couldn't detect the 15% ABV at all!
TLDR: Clean and sanitize your picnic taps often!