Inspired by the moth thread, I have a question of my own. For years we have had spiders and spider eggs embedded on our front porch. I know it sounds gross, but a casual visitor would not notice, and it's a very big porch with a high ceiling :)
We have power-washed it all away numerous times, but they always come back. I have no idea how to fix this problem, or why we have it in the first place.