Deer Deterrent

[TomatoDon]

I plant my farm tomatoes in an open field and we've always had a lot of deer on the place, but they never bothered the tomatoes until this year.

I know about electric fences, have heard about human hair and tin pie plates and sacks and bells tied to string around the patch, and it may come to that. But is there any kind of spray, such as neem oil or a hot pepper based spray that will stop the deer?

Thanks.
Don