Old grapes

Back in the woods well away from my house there used to be an old homestead.  All that is left is the foundation and junk that I have slowly been removing.  Or so I thought.  As I was picking up yet another bag of junk, I stumbled on what looks like a 16 foot grape arbor.  It is full of honeysuckle,  wild berry's, and who knows what.  Yes, grapes are forming.  So, it is worth the fight to clean it out and save the grapes?  How do i proceed?

I think it depends how much you want the grapes... There is no guarantee that the grapes are actually from the original cultivar vine, rather than just wild grapes or a hybrid or whatever. (Unless you saw the old vine and were like "whoah that's a gnarly old vine!" Unless you want grapes enough to be okay with ending up having to plant a new vine after finding the existing grapes unpalatable, it might not be worth it. If you're really excited to salvage that arbor it's more likely to be worth your time. You could wait and see if any grapes survive to harvest, and taste them and see what you think, but usually the grapes here fall off or get eaten by birds before we can try any because we don't tend the vine.