So I inherited several of my dad's guns, including a lovely Winchester model 1892 .25-20 that I haven't dated yet but is probably going on 70. Unfortunately, though, it's been neglected - stored in the basement. It appears to be in generally ok condition but has quite a bit of light rust and light pitting. What's the best way to take care of it? A good cleaning? A trip to the gunsmith? Something more drastic?