I have no idea if it would work on a boat or on the east coast, but here in WA we have a farmhouse on acreage, and there are lots of spiders. We have the perimeter of the house treated monthly with a mixture of peppermint and rosemary oils (and I am not sure what else, but it is all organic) and it seems to work pretty well. Smells nice too. I don’t like the idea of harsh pesticides getting into our waterways . . .
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