Ah! I'm not much help there.
I had a bad problem with scale on my indoor fig tree. I ended up spraying it down til it dripped with Safer's insecticidal soap. It did get rid of it for the winter and first part of the spring then they returned when the figs were starting to form on the tree and I didn't want to spray it. they got out of hand and I ended up taking cuttings from my tree and getting rid of the mother plant (I wanted the room indoors for other plants too for it had grown quite large.)
Rather server treatment . I'm sure you could find something bette.