I have been calm and patient with spiders living in my old concrete barn..but now its just too much. Every inch of my barn has spiders in it. And I am almost sure they are the poisonous kind. I have had it. How can I kill and repel these nasty creatures. And please dont talk me into leaving them be. I have had it with them. I have heard to put lemon pledge on surfaces where they are and also peppermint oil. Would a peppermint plant work? Please..any suggestions?