I'm joining the chorus of leave the spiders alone! Every single living thing which might, just might, impact upon Homo sapiens has to be killed - if it's not mice, it's wasps, ants, spiders, moths...the list goes on. Insecticides, herbicides, fungicides, all dreadful chemical concoctions which are slowly, but surely, poisoning our world. Remember Rachel Carson's 'Silent Spring' - how right she was
What makes humans so superior that they have to destroy any living thing? Do people really want to live such a hermetically cleansed and sealed existence that nothing else is allowed to live?
I have spiders aplenty in my house, along with woodlice, violet ground beetles, a shrew which lives in the kitchen, bats in the roof space, sparrows in the thatch, a garden full of voles, long tailed field mice, yes, even the odd rat on occasion - all are welcome, it is their home too!