I occasionally find hooks or lures that seem to be in good enough shape to use, which is why I'm asking. I like having varied hooks in my kit, and found ones help with that.
I asked about the cleaning partially because I just recently found this lure:

And I was thinking about trying to swap out that beat-up fish so I can use that little hardware rig inside it. For whatever reason, the little ring has its hook through an eyelet instead of a connecting ring. I've decided not to, though, because a quick Google search (it had a brand name on its spinner) revealed that it's probably rather old. I won't be selling it (ones in perfect condition apparently go for like 5 bucks, this beat-up thing is probably worth 50 cents), but I think I'll keep it for display instead of using it. I kinda like how it looks.