Just a bump, I finally got around to working with un-du. It seems to work a bit better on stickers than bestine. it seems to me like it evaporates faster too. So it seems to be better for removing stickers, but not quite as good at removing say, markers. But I've just now started messing with it, and I'm out of bestine to compare the two, but they're very close in performance.
Too bad a quart of un-du will be about $55 vs $16 for bestine off amazon. So I'm sticking with bestine.