The biggest problem with buying fruit in bulk from Costco is that they go bad so fast! Fill your sink or a bowl, add 1 cup vinegar and stir. Add fruit (grapes, apples, raspberries, strawberries, blueberries) and soak for 10 minutes. Rinse with clean water. The water will be dirty and the fruit with sparkle with no wax or film residue. If you add berries, it will keep them from molding. I have the toughest time with raspberries and this works! Strawberries last a week longer than usual!