What INT gear could I upgrade for the next 10-20 extra INT?

How about an INT shield? They're pretty expensive, but a 5 INT one shouldn't be too much. Perhaps a better wand, too, since 7/7 60%s isn't quite up to par with your other stuff, especially considering wands are cheaper than most of the other stuff (that can be used by mages). Glove and shoes too, but I think you're working on those.

Why do you want to wash so bad anyways? Buccaneers have all the HP they need without washing.