Friend and flatmate's father had some health problems, and it was discovered that his house had descended into Hoarderdom since they were last there. A substantial amount of guns and ammo have been rescued from the place, but many of the firearms are in seriously bad condition. Rust is rampant, and other such problems.
Presently I have hold of a revolver that was left soaking in oil until the oil congealed in it. I'm going to disassemble the thing, hose it out with brake cleaner, and see if I can get it halfway presentable. Might just get a near-free revolver out of all of it. Definitely going to take that and all the other guns to a professional for a judgement whether any of them are safe to use after they've been cleaned up.