Spider Infestation posted by ZXRider(SoCal) on February 26, 2009 at 10:00 PM
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cabin that apparently drives spiders away. It emits a certain frequency that is supposed to "annoy" spiders. They claim it really works.
Perhaps you could try something like that. Plug it in with an extension cord and leave it under your car (or in your engine bay) for a few days. Might be worth a shot.