This made me think of something.... Drosera and Pinguicula will
died if sprayed down with Safer's Insect Soap when it's left on the
plant. I did get good results, however, on *Pings* by spraying them
down and letting the soap sit for a minute or two and then washing
it off with pure(ish) water. The bugs die, the plants live and
with no loss to even their dew production.
Dave Evans