i used to scrape my pieces with a surgeon's skill, laboring over getting all of it out. the resin used to get me blistered but now it makes my head hurt and i don't pursue that avenue anymore. tastes nasty as well. i even had a set of bowl cleaners that i fabricated from coat hanger wire and guitar strings that were in my bong case (makita drill case butchered into a "happy" case) in the bit storage area. got stolen out of my car by a friend who was notorious for stealing your pipe or water bong just so he could scrape it. jeez, that was fifteen years ago! good heavens.