Again just anecdotal evidence - or maybe "mind over matter" coupled with wishful thinking - but I have observed the elimination of small "bush snail" infestations after spraying with leftover coffee.  I have no idea what the caffeine concentration is in such a brew, but it's probably not much, but there's plenty of other chemicals in there that might be unacceptable to the snails.

Ray Barkalow - First Rays Orchids - www.firstrays.com
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