It already smoked out of it so it's not clean. I haven't smoked out of a bong since I began smoking 3 years ago. I had no idea how much more efficient it is than smoking out of a pipe. Usually a smoke session with a friend using my pipe takes us around 4-6 bowls to hit the spot. For the bong, 2 bowls and we're absolutely gone. I can't get over how big the hits are. The bubbling is quite cool too. Cost me $30. Is that a decent deal?