This one corner of our house is just swarmed with box elder bugs and I want to get rid of them for good, we even cut down the box elder tree that was by our house and they are back this year.
You should try one of Jerry Baker's tonics. One of the ingredients is liquid dish soap, which softens the bug's body, rendering them as good as dead. You will need a hose-end sprayer (available at any home garden store if you don't already have one).
