Diazinon works very well for that, as does Malathion. Most any insecticide that kills on contact, is rated for ornamentals and approved for home use will do the job without causing harm. Just mix according to instuctions and leech away. You might plan on doing your plants about a week or so before bringing them in, and watering the plants outside one last time afterward. That'll minimize any residual insecticide odor indoors.