Getting rid of bush snails?

[Ioana]

I have 2 terrariums containing mostly mounted miniature orchids (on bark or tree fern), with leftover moss from a show in the bottom. I seem to have introduced some bush snails with the moss, and they are now happily munching my plants.
I looked at an earlier thread on snails, and it seems not much touches those little ones.. Ray mentioned 1% cinnamon oil in 70% rubbing alcohol being effective: does one spray the solution on the plant, soak the plant or what? Any other suggestions?