I have seen this fruit wash several times on Pinterest and my father-in-law actually mentioned it as a helpful hint. Since he was hip on it I thought I better try it out to see if it actually worked. So I bought my regular batch of fruit from Costco and brought it home, washed it in a mixture of white vinegar and water.
This wash called for 1 part vinegar (white or apple cider) and 10 parts water. Well I eyeballed it and here are the results.
After soak in vinegar wash. I washed the strawberries, blackberries and raspberries in the wash.
5 days later. Most all of the fruit was in good shape. The raspberries were better off than without the wash but I think due to their fragile nature they were more mashed than the other fruit. All in all I would recommend using this technique on your fruit to help extend the life of the summer gems.