To keep wasps from setting up a home near your front door or around your home - mix 2-3 tablespoons of Dawn dishsoap and about 2-3 cups of water. Put into a spray bottle, shake and that's it. Spray where they keep coming back to, to make a new nest. This will also kill them and drop them like a hat. Read More at: botgardening.blogspot.com
Prevention of wasps and yellow jackets. Slice a fresh cucumber into thin slices and arrange them in a single layer on an aluminum pie plate. The cucumber must be fresh – the pan must be aluminum. The cucumber reacts with the aluminum and gives off a chemical reaction/scent that is undetectable to humans but drives wasps and yellow-jackets away and makes them flee the area.
Homemade Non-Toxic Wasp Spray / Repellant : combine together in a squirt bottle 2 cups of water + 1 teaspoon of peppermint oil + 1 teaspoon of dish soap (optional); wait until early morning or late evening hours when it looks like they’re sleeping, then shake and spray! You might need to apply the solution twice, but they will fall to the ground and die within seconds. Talk about a natural remedy!