Over and over.
Is there a better way? Not really. Killing the spiders means letting insects run wild in the yard. And all of those bugs will bring in more spiders. The critters we kill make space for new critters. There really is no end.
For more information on spiders in the garden, click here. Once you read, you may decide that you need them. I can't say that it's worked for me, but it might work for you!