Cleaning Glass Pipe
Of course, you can just get out of the tube and go, but sometimes the resin built to the point where you have to do a little more thorough cleaning. Instead of scraping and prodding, try soaking in isopropyl alcohol and salt.
People over wikiHow suggests that glass tube cleaning should not be so difficult. Only remove most of the resin and then placed in a Ziploc bag with 90-100% isopropyl alcohol for a good three hours of soaking. You can also use some non-iodized salt as an agitator for faster cleaning. If the salt is added, you may not need to soak for a long time at all. Just shake the bag until the pipe is nice and clean.