Sorry to say but haven't done a good job of keeping the shanks clean of my pipes. I always run a pipe cleaner thru after each smoke but cleaning the shank is another story. I don't drink alcohol but found apple cider vinegar works very well. I went thru a full pack of cleaners dipping in the vinegar and scrubbing. Some of them had built up a cake in the shank as to where a Dill cleaner would barely pass through. There may be a better method but this worked for me. Hopefully I'll be more attentive in the future.