I clean up stuff whenever I see it. Mostly in articles about animals.
Those of you who dig into my edit history might find a bit of a naively pro-modern-Israel sentiment. I've since educated myself.
I'm active in other places:
Scots Wikipedia (we all know of that fiasco... I don't speak Scots but I know "an aa" comes after the list of alternatives and not before, and I tag articles with shoddy Scots)
Vietnamese Wikipedia (a disturbing number of articles about non-Vietnamese animals seem to be the result of putting the equivalent English Wikipedia article throught Google Translate, and they've gone unnoticed for yonks... I'm out to correct that)