Black Widow Spiders/Pest Control (a dumb question)

[zman]

This question might be bordering on being stupid, but my backyard where I keep my boat is just one of those yards that for whatever reason has a problem with black widows showing up everywhere. I think its the neighbor's old rundown garage (sort of like the wine cellar in arachnophobia), but that is out of my control.

Anyways, I just added a casting platform to the front of the boat, and besides being a great addition to the boat in terms of fishability, it also might be prime habitat for black widows. Many of us keep our boats outside, I was wondering if there is anything I can do to ward off especially spiders, but I guess I would rather not have ants or roaches in the boat as well. Should I just spray raid under the deck before every outing or what?