If you have some prune like grapes in the fridge that have either sat on the counter too long or just didn't get eaten quick enough, don't throw them out! There is an answer!
Here is the photo of the before prune like grapes I had.
Take a large mixing bowl and fill with "cold" water. Immerse the grapes into the water and let sit for about an hour.
Drain and put back in the fridge. Your grapes will be good as new!
Happy Cooking ;)