Well, deer haven't gotten to my vines yet (the 54 vines were just
planted this year, and their shoots are still a long ways from teh top
of the growth tubes), but...

I've been using a product called "liquid fence" for a year on my roses
and new fruit trees. It really seems to work. Probably find it at a
good garden store, or farm store. It's made of rotten egg solids and
garlic, and you don't want to stand downwind when you spray!

I've had friends use soap (another traditional repellent), but they
only got soapy wine, and little of that as well, since the birds or
deer took care of all their grapes. I've also heard of blood meal
working, as well as the scat of big animals (dogs/cats/bear). I don't
know how you convince them to dump in the vineyard, but there you are.

I've also hit on another possibility for the future - there are 3-D
hunting targets out there, of cougar, bear, bobcat, and coyote.
Thought I'd try that one day if I can save up the money.

I've really decided with the deer, the real answer is just encourage
them to eat something else. They'll eat anything, so just make the
grapes (and roses) the least palatable food sourse around.

Good luck. To both of us!

Rob