I have a yellow brass Bach slide that I don't use, there are plenty of dents and a dollop of rot on the end of the inner slide. I was wondering if I could even get any money out of selling this or should I take this to a repair shop to have it looked at and somehow get rid of it? At this point I just want it gone but I wanted more input on how I could benefit from keeping it or something along those lines.

I'd just sell it as is.

Probably worth around $300 including shipping, for parts.