I love grapes.  But since grapes are on the “Dirty Dozen” list of fruits and vegetables with the most pesticide residue,

Fill sink with water, add 1 Cup of Vinegar, and Stir. Add all fruit, and Soak for 10 minutes. Water will be dirty, and fruit will sparkle with no wax, or dirty film. Great for Berries too, as it keeps them from molding. Do this with strawberries, and they last for weeks! I like to take the grapes off the vine and store them in a bowl in the refrigerator.  I take this extra step to prevent waste.   If you leave them on the vine they will rot in the fridge before anyone eats them.  But, if you take them off the vine, wash them, and put them in a bowl, they don’t last more than a few days in my fridge.