I hope Alexx Cheng doesn't mind if I share this tip from him that he shared to everyone at the Frantz Art Glass Bash this past weekend:
To de-scum scummy glass, use 200-220 grit wet sandpaper with water and sand the rod. then wash it off. The rod will look frosted until you introduce it into the flame, then wa-la clear glass. I haven't tried it yet but I have tons of yucky clear from over the years, I'm going to give it a go.
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