Damn aphids! I have given up on an outside Ficus plant after going through two bottles of Neem oil. Little bastards keep coming back for the new growth. All I can do is swipe and crush their little bodies when I see them.
Couple these guys are waiting for me to say... wait for it... fans. If you are outdoor, go with ladybugs or other predatory insects. If you are inside, pump up the volume, quantity, and direction of your fans to blow them back to the Hell from whence they came. Maybe you're a manly fan man. Maybe you have those industrial warehouse fans you can put outside. Just a thought.