I’m not sure what kind of normal maintenance you would normally do on a guitar, used, new or your own?
Strung up, I check for high frets and mark.
Then I always take the strings off, check everything is tight, give the fret board a once over look, polish with a rag and depending I might use linseed oil, or just orange or lemon polish and wipe everything down, new strings. For pots, I have a contact spray, usually give that a light spray over for toggles n pots.
Nothing you’ve mentioned sounds terrible, the fret board looks light a light scuff of 2k grit or more would clear that up. Something I would do if I saw that during a string change.
You either like it or you don’t, if you like it, clean it up and enjoy.