Aphids on purple passion plants?

Washington, DC

Hello! I have purple passion plants that I've been propagating indoors for roughly 20 years -- they originally belonged to my now-late grandmother. I've been having an onslaught of aphids or something else that's small and white, kind of like a sliver of a sesame seed. I've tried rinsing, cutting back, and spraying with water with dish soap, but the latest infestation is quite determined. Is there anything that I can do? I'm attached to the plant for nostalgic reasons, would like to fix it if at all possible.

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