What's the best method to use when cleaning a glass pipe? I got one recently (well.. a month or two ago, but I've only used it maybe 3 times) And it looks something similar to this. I wash it out as best I can after each session; even drown it in boiling water for an hour or two. But what about the resin building up inside? Sorry if this seems like a total newb question, but you guys seem like you know what you're doing so I thought I'd ask.