If you can find it at a plant store, you may have to look around a bit, use Neem oil. You put some on a cloth or a q-tip and wipe it all over your plant, both sides of all the leaves... the following day take a dry cloth and wipe off any excess Neem that the plant has not absorbed or that hasn't evaporated and your plant should stay bug free. Neem oil is a natural pesticide that kills aphids and many other creepy-crawlies, it's been around for centuries, originating around India (or somewhere over there) but it's just not too well known in the U.S., although many pot farmers in Europe swear by it. I learned about it on Overgrow.com years ago (they no longer exist, but many folks here are familiar with the site) and the people I've known who have needed and used it all found it to be an effective natural pesticide against aphids, white flies, and other insect pests as well.