My wife gave me a used Pentax 50mm f/1.7 SMC-M for my birthday. (I know some people get Leica 50mm f/0.95 Noctiluxes for their birthdays, but, y'know, kids to take care of and so on. And it's a very nice little lens!)
The glass is in good shape, but there's a small amount of rust around the lens mount. I don't think this is really a problem, but I'd like to clean it. What's the best approach?
Most rust-removal advice I've found online is geared towards much larger amounts of rust (cars!), and I'm concerned about affecting the plastic with an acid-based product.
Or should I just not worry about it? I'm a software guy, so all this physical-world-stuff is all confusing to me. Is there any concern of it spreading or causing other damage?