As for fly repellent, the only information I know of is that, consumed, it can act as a natural repellent. However, I have to say this is in reference to animals, such as horses and dogs, etc.
Lulu has spoken of keeping horses. Perhaps that is what she is referring to. I realize that Buck and I consume quite large quantities of garlic. Probably more than most folks in our community. We are also not bothered by flies. Ooooooh, that may have to do with regular bathing, though.
"As a girl I had zero interest in the stove." - Julia Child
This is real inspiration. Look what Julia became!