Hi everyone! I'm a new member to the SOTW forums and I was wanting to see if anyone could answer my questions. I'm a musician in high school right now and I am ready to buy my first sax. There's a Cannonball hotspur tenor I've been looking at and the owner says it plays perfectly, there's just a lot of stuff needing to be cleaned. From the looks of it, the exterior bell is pretty spotted with green stuff in lots of places and on the keys and rods. There's quite a bit of it. I can't see the inside of the sax from the pictures but it looks like there's probably green stuff in there as well. It's not an old hotspur either, it's a recent Stone Series model. Is there a way to take this off, and how much would it cost? Will it corrode the sax? Is the sax worth the effort and money? Thank you in advance!