I've never used neem. Give the dish soap a shot and see if it works for you, just be sure to rinse them off about an hour or so afterwards. Alternatively you can just give them a spraying with the hose and nozzle. You only need the pressure to be high enough to knock the aphids off the plant. Make sure to get under the leaves as well. I've had to use this method as I've had to bring my plants indoors. Doesn't really kill them and I have to coninuously go back and spray them off.
So far the only thing I've found to be an effective control of aphids is pesticides and ladybugs. I don't want to use pesticides indoors and all the ladybugs have long since died. I'm currently relegated to spraying them with the kitchen sink sprayer and pinching them with my fingers. It's a daily pain in the ass.
So far the only thing I've found to be an effective control of aphids is pesticides and ladybugs. I don't want to use pesticides indoors and all the ladybugs have long since died. I'm currently relegated to spraying them with the kitchen sink sprayer and pinching them with my fingers. It's a daily pain in the ass.