I think I'd pull the plants if you don't care that much for the tomatoes. I grew two currant tomato plants one year and pulled them half way through the summer and they had no disease/pest issues that I recall. They grew out and over into my other plants, the taste was unremarkable, and fiddling with the tiny berries was a nightmare. Never again.
If you do fight the bugs, then I think your soap and water approach would work. I read on this forum to just spray aphids off with a hose. I did that the one year I had aphids and ants take over a tomato plant and it worked. Right now I have aphids on my okra. So far they have just swarmed on one okra pod at a time so I just cut off the pod and throw it over the fence.
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