Aphid Control Help Needed

[MuddyBuckets]

Wow, all of my healthy starts of peppers, tomatoes, okra and squash have aphids. I have rinsed the leaves and sprayed with insecticidal soap and rinsed the next day but they seem to be multiplying. Plants look healthy but it is a continual battle since they have another 3 weeks under the lights.

Any of my fellow gardeners have suggestions to get rid of the aphids or at least control them? Is a Neem oil spray a good control or a pure soap solution better?

HELP!