Why not ethyl alcohol? Laquer thinner seemed to do the job, too.

Paul

1. If the temperature is above 50 F (10 C), take the plants outside
and spray them with whatever pesticide appeals to you. Those with low
toxicity to mammals include pyrethrins and imidicloprid, but you can
use nastier stuff if you wait until the plants are dry and don't let
the cat chew on the leaves. Always follow the manufacturer's
directions regarding protective equipment.

2. If you absolutely cannot put the plants outside, use horticultural
soap, neem oil, or isopropyl rubbing alcohol (don't use ethyl
alcohol).