Don't know for sure. There should be an insecticide. Go to
the store. What about Sevin?
Also I would just wait a bit, till it gets a bit warmer outside
and put the hibiscus outside on the porch, perhaps with
some air-circulation. When all else fails - use your
first hunch (throw it away).
But many plants that do poorly inside in winter may re-
cover out-of-doors. JULIUS
Greetings from J.H., the learning machine!