Did a quick google search and found that neem oil is probably the best way to go. look it up, there's lots of info on it.

Another method I found was to spray the leaves with a 50/50 mix of isopropyl alcohol (rubbing alcohol), water, and 5 drops or so of dish soap per quart. Supposedly continuous weekly application of this keeps the bugs off. This sounds a little sketchy to me though, so Id isolate one leaf somehow and try it on there first if you decide to go this route.

I'm sure there's plenty more methods out there... any body else got any?