I saw an advert in English and Spanish on the 'brighterspain' site, I think it was in the 'whats on section'. Something about being effective for 3 months without water, whatever that means. Might be worth getting more info. about this, I think the person had a web site so when I get a moment I will have a look. Failing that you could try getting hold of nobtots pitcher plant and wave it at them, that would be enough to scare off anything living I imagine!!!!!!!!