I bring bouquets of fresh flower to the office all summer. Everyone gets flowers. What I didn't realize is, every one got a dose of my garden's aphids, too. My hoya, residing on my office window sill were loaded with aphids. Innocent by standers minding their own business.
To get my poor vines back to health, one evening I backed out of the office after spraying down the vines with a soap & water mister, before shutting the door for the weekend ! It worked, we are normal again.