Previously we had a trailered sailboat, this will be our first year with a permanently slipped boat on the great lakes (it appears to me that fresh water attracts spiders like moths to a flame). The boat isn't even in the water yet and already it is becoming home to spiders. What methods are there to kill the current spiders onboard and dissuade others from taking up residence? My mom is seriously allergic to spider bites, so this is of great concern to me.