I have been smoking a pipe for a few decades and in that time have tried almost all methods- water, rubbing alcohol, pipe sweetener, no clean method, everclear, vodka, rum etc etc.
For some reason, with rubbing alcohol (and pipe sweeteners), I get a bitter taste no matter how long I leave it to sit and dry out. Seeing as that I don’t drink alcohol I really tried to like the rubbing alcohol method but I just could not. Switched to everclear and never looked back. Not to say that I don’t use other methods from time to time but mostly the everclear.