You can easily make this yourself using products found at a health food store or a health food section in a grocery store. This repellant will work very well but is not a pesticide, so it has no harmful neurological effects. The essential oils will prevent this mixture from becoming rancid!
The quantities can be raised or lowered but just keep the ratios the same.
1/4 of mixture should be a carrier oil (I suggest extra virgin olive oil)
Then add the following essential oils to the carrier oil in equal quantities:
lemon
peppermint
eucalyptus
lemongrass