Type garlic-pepper spray into the Google Custom Search box above and you will find a number of threads about it.
The garlic is important as a pest repellant.
I don't have any particular recipe I follow, just blend up some mixture of garlic, onions, various peppers, maybe some tansy or other aromatics and whatever else repellant I have on hand. Let it sit for a little while, then strain all the solids out, add a few drops of dish soap and a few drops of vegetable oil (to help it stick better), dilute, and spray.
The straining is important. I always have sprayers clogging up because there were still fine particles left.
Your garden thanks you for not using the Sevin!
But even using all edibles, it is important not to just go spray your whole garden. You don't want to drive away all the beneficial insects. Just spray where there is some problem getting out of hand. For four-footed animals, squirrels, raccoons, woodchucks, etc, really you need to fence.