My experience:
- Dryer sheets work pretty good for a little while. Good for as supplement to other remedies.
- Electronic pest repellents work great for wasps. they need to be plugged in and they make a hideous noise that will drive people nuts along with the bugs.
- I use a product called "Viper." It is odorless and persistent. Similar to Ortho Home Defense, but higher concentration of the good (bad, if you are a bug) stuff.
- By the way, I discovered Viper when trying to find a way to prevent the annual lady beetle infestation at my house. Works great for lady beetles and all other bugs, like wasps and carpenter bees.