I have used corn meal to get rid of ants in an area. It seems to kill the whole nest so I would have cleaned out the mailbox and put cornmeal at the base of the post holding it. The corn meal isn't harmful to anything else so is safe to use and cheap.
I have used corn meal to get rid of ants in an area. It seems to kill the whole nest so I would have cleaned out the mailbox and put cornmeal at the base of the post holding it. The corn meal isn't harmful to anything else so is safe to use and cheap.