Wasp repellant. Fill a plastic bag with water, drop a penny into it and hang it above an entrance/patio door and it will prevent the yellow jacket wasps from entering your house and will also help keep them away from your patios. It tricks them into thinking it is another nest so they avoid that area.
How to make a wasp, hornet or yellow jacket trap from a 2 liter bottle. To keep the bees from getting in here (and keep them doing their good job!) just add apple cider vinegar. Bees don't like the sour, but wasps do.
How to trap and kill carpenter bees, wood bees, wasps, hornets and yellow jackets naturally.